Ian Morison tells us what we can see in the northern hemisphere night sky during April 2016.
Highlights of the month
April - still a great month to view Jupiter.
This is still a great month to observe Jupiter. It lies in the southern part of Leo, but still reaches an elevations of ~48 degrees when crossing the meridian during the evening. An interesting observation is that the Great Red Spot appears to be diminishing in size. At the beginning of the last century it spanned 40,000 km across but now appears to be only ~16,500 km across - less than half the size. It used to be said that 3 Earths could fit within it, but now it is only one. The shrinking rate appears to be accelerating and observations indicate that it is now reducing in size by ~580 miles per year. Will it eventually disappear?
The features seen in the Jovian atmosphere have been changing quite significantly over the last few years - for a while the South Equatorial Belt vanished completely but has now returned to its normal wide state.
April: Look for the Great Red Spot on Jupiter
The list below gives some of the best evening times during April to observe the Great Red Spot which should then lie on the central meridian of the planet.
- 1st - 23:47
- 4th - 21:16
- 6th - 22:54
- 9th - 20:24
- 11th - 22:02
- 13th - 23:41
- 16th - 21:10
- 18th - 22:49
- 20th - 21:03
- 21st - 20:18
- 23rd - 21:57
- 25th - 23:25
- 30th - 22:44
April 3rd - 22:00 BST: Ganymede emerges from Jupiter's shadow
During the early evening, Jupiter will apear to have just 3 Gallilean satellites: Io and Callisto to its right and Europa to its left. Ganymede is hiding in Jupiter's shadow but will emerge just after 22:00 BST later in the evening.
April 6th: just before dawn - the Moon occults Venus
On the 6th of the month, the Moon and Venus will lie close together low in the eastern sky before dawn. At 08:28 BST, as observed from the centre of the UK, Venus will disappear behind the disk of the very thin crescent Moon whose phase will be just 2%. This will be quite an observing challenge and will need binoculars or a small telesocpe to observe along with a good low eastern horizon. BUT BEWARE NOT TO OBSERVE CLOSE TO THE SUN! If possible stand in the shadow of a wall to the left of your position. Ideally, using an equatorial mount, locate the Moon when it rises at 06:20 BST and continue tracking as it approaches and then occults Venus. As seen from the centre of the UK, it will emerge around 20 minutes later as it briefly passes behind the Moon's northern dark limb. The occultation will not be visible from Scotland and, in the northern part of the UK, Venus will be seen to graze along the Moon's rough northern edge. Venus will take ~60 seconds to disappear and ~70 seconds to emerge. NOTE: to show the occultation graphically, I have had to remove the Sun's glare - this will be a very difficult observation.
April 8th: 45 minutes after sunset - Mercury and a thin crescent Moon
Looking west after sunset and as darkness falls, Mercury will be seen just 6 degrees to the right and slightly up from the a very thin waxing crescent Moon.
April 16th - mid evening: A waxing Moon nears Jupiter
During the evening the Moon will be seen gradually nearing Jupiter, closing in to a separation of just over 4 degrees at 22:00 UT.
April 21st all night: The Moon at apogee
On the 21st the Moon, one day from full, reaches apogee, that is at its furthest distance from the Earth. So, on the following day, it will not appear as big - or as bright - as when the full Moon is at perigee, its closest approach to the Earth. Perhaps surprisingly, its angular diameter at apogee is 12% smaller that at perigee and, should a solar eclipse occur near apogee, the Moon's full shadow may not reach the Earth giving rise to what is called an annular eclipse.
April 16th and 29th: Two Great Lunar Craters
These are two good nights to observe two of the greatest craters on the Moon, Tycho and Copernicus, as the terminator is nearby. Tycho is towards the bottom of Moon in a densely cratered area called the Southern Lunar Highlands. It is a relatively young crater which is about 108 million years old. It is interesting in that it is thought to have been formed by the impact of one of the remnents of an asteroid that gave rise to the asteroid Baptistina. Another asteroid originating from the same breakup may well have caused the Chicxulub crater 65 million years ago. It has a diameter of 85 km and is nearly 5 km deep. At full Moon - seen in the image below - the rays of material that were ejected when it was formed can be see arcing across the surface. Copernicus is about 800 million years old and lies in the eastern Oceanus Procellarum beyond the end of the Apennine Mountains. It is 93 km wide and nearly 4 km deep and is a clasic "terraced" crater. Both can be seen with binoculars.
Observe the International Space Station
Use the link below to find when the space station will be visible in the next few days. In general, the space station can be seen either in the hour or so before dawn or the hour or so after sunset - this is because it is dark and yet the Sun is not too far below the horizon so that it can light up the space station. As the orbit only just gets up the the latitude of the UK it will usually be seen to the south, and is only visible for a minute or so at each sighting. Note that as it is in low-earth orbit the sighting details vary quite considerably across the UK. The NASA website linked to below gives details for several cities in the UK. (Across the world too for foreign visitors to this web page.)
Note: I observed the ISS three times recently and was amazed as to how bright it has become.
Find details of sighting possibilities from your location from: Location Index
See where the space station is now: Current Position
Jupiter reached opposition on March 8th but this is still an excellent month to observe it - high in the southern sky during the evening. It crosses the meridian at around 23:00 (UT) at the beginning of the month and around 21:00 by month's end. Its brightness falls slightly from magnitude -2.4 to -2.3 whilst its angular size drops from 44 to 41 arc seconds. Jupiter spends the month in south-eastern Leo, moving slowly westwards in retrograde motion. With a small telescope one should be easily able to see the equatorial bands in the atmosphere, sometimes the Great Red Spot (see the highlight above) and up to four of the Gallilean moons as they weave their way around it.
Saturn rises at ~02:00 (UT) as April begins and a little earlier each night so that by month's end it rises at about 23:00 (UT). Shining at magnitude +0.3 and brightening to +0.2 during the month it lies in the southern part of Ophiuchus some 5.5 degrees up and to the left of Antares in Scorpius. Its diameter increases from 17.4 to 18.1 arc seconds as April progresses. It will be due south in the early hours of the morning at an elevation of ~19 degrees. The beautiful ring system has now opened out to ~26 degrees - virtually as open as they ever become - and measures 40 arc seconds across. It will be best observed near the meridian during the hour before dawn. If only it were higher in the ecliptic; its elevation never gets above ~19 degrees and so the atmosphere will hinder our view of this most beautiful planet. Sadly, as seen from our northern climes, on each successive apparition it will get lower in the sky, so now is the time to emigrate to the southern hemisphere!
Mercury. This month, Mercury has its best apparition of the year for those of us in the northern hemisphere, shining in the west-northwest during the evening twilight. As April begins, it is low above the horizon, but shining brightly at magnitude -1.5. It reaches greatest elongation (east) on the 18th of April, so is higher in the sky, but its brightness will have dropped to a still bright magnitude 0. Then, its highest altitude at sunset will be ~19 degrees, but Mercury will still be at an elevation of ~10 degrees 45 minutes after sunset. At greatest elongation, its disk will be 7.5 arc seconds across with 38% of the disk illuminated. During the latter part of the month, it fades rapidly down to magnitude +1.5 and disappears into the Sun's glare around the 28th of the month as it moves towards inferior conjunction on the 9th of May - when we will observe a transit of Mercury - one of two major highlights for next month!
Mars. At the beginning of April, Mars rises around midnight (UT). As the month progresses it rises earlier each night so at about 10pm (UT) by month's end. It starts the month in Scorpius, moves into Ophiuchus on the 4th and, as it begins its retrograde motion westwards on April 18th, moves back towards Scorpius which it re-enters on the first of May. Its brightness increases dramatically this month, increasing from magnitude -0.6 to -1.4. At the same time its angular size increases from 12 to 16 arc seconds - the largest it has appeared for some ten years! But as it reaches opposition on the 22nd of May it will subtend over 18 arc seconds. So now is the time to start seriously observing Mars when details such as the polar caps and dark regions such as Syrtis Major should be easily visible in a small telescope on nights of good seeing.
Venus,rises less than half an hour before sunrise at the start of April and could be seen given a low eastern horizon, but it will be unobservable after the 9th or so. However, it will be worth attempring to observe it on the morning of the 6th when it is occulted by a thin crescent Moon as detailed in the highlight above.
Haritina Mogosanu from the Carter Observatory in New Zealand speaks about the southern hemisphere night sky during April 2016.
This campfire story is dedicated to Stuart @astronomyblog
Welcome to the month of April. My name is Haritina Mogosanu and tonight I'm your starryteller from Space Place at Carter Observatory in Aotearoa New Zealand.
I love the Milky Way. The Milky Way is the most spectacular feature of the Southern Hemisphere but to say that is such an understatement. The Milky Way is so striking here and I believe that in the absence of a polar star (which I found hard to find in the Northern Hemisphere anyway), people could even orient themselves by the Milky Way. And why not? We can easily see the Milky Way from Wellington, which according to Lonely Planet is the the coolest little capital in the world. But is still a city, which means that it does come with light pollution and from most of the cities of the world we are lucky to see just the brightest stars. Yet I have noticed when walking home at night from the Observatory, from my street I can still see the Galaxy. I call it My City of Stars. There are times when I look up and gaze straight at the center of it. This time of the year just after sunset I can see from the centre to the edge from Scorpius to Taurus, in one glorious panorama.
So in April, my beautiful City of Stars is stretching through the night sky from northwest to southeast. Allow your gaze to wander along this celestial tapestry and you will see the brightest stars. Let's start from West. Lining up onto the celestial river are:
- Very low on the horizon, Aldebaran - in Taurus, with a magnitude of 0.86. Magnitude is the logarithmic measurement of the brightness of the stars. Logarithmic means that each step of one magnitude changes the brightness by a factor of about 2.512. A magnitude 1 star is exactly a hundred times brighter than a magnitude 6 star, as the difference of five magnitude steps corresponds to 2.512 multiplied by 5, which is 100.
- Castor and Pollux - in Gemini with magnitudes of 1.93 and 1.14
- Betelgeuse - in Orion with a magnitude of 0.42
- Procyon - in the Small Dog, with a magnitude of 0.34
- And Sirius - in the Big Dog. With a mgnitude of -1.46, Sirius is among the brightest stars in the sky. By convention, the brighter the star, the smaller the number and so some stars and objects have negative magnitudes, like Sirius, or like the International Space Station which can reach up to -6 magnitude, or the full Moon, which has a magnitude of -13. The big dog constellation finally looks the right way up heading also to the western horizon too. From it, turn your gaze left.
Nearby comes Canopus -0.72, the second brightest star in the sky. Canopus is not in the white band of the Milky Way. Standing tall, Canopus is high in the sky. Canopus is a circumpolar star from Wellington, which means that it goes around in circles in 23 hours and 56 minutes, riding the celestial Ferris wheel of the Southern Skies, a giant wheel that never stops, day after day, in a sidereal time cycle, as long as the Earth is turning.
Besides Canopus, there are other stars lighting the gondolas of the big wheel but not each and every gondola has a bright star inside. If Canopus is on the top of the big wheel then just imagine that the diameter of the wheel is from Canopus to the horizon. Looking clockwise from Canopus in the 4 o'clock position on the wheel is the Lone Star, Achernar. Achernar marks the end of the grand river Eridanus, the river-asterism that flows all the way from Orion to the southern world. At 0.4 magnitude it shines bright in a region that seems devoid of other stars. Lower down, a peacock (Pavo) takes a ride on the wheel. It's main star, which carries the mundane name of Alpha Pavonis (which literally means the brightest star in Pavo), is in the 7 o'clock position on the giant turning wheel, almost as if is just hanging on the side.
Following the imaginary curve of the wheel, two very bright stars show up closer to the 10 o'clock position. Firstly, the third brightest star in the sky and our closest neighbour, Alpha Centauri, and then Beta Centauri. They point up at the Southern Cross which is even higher than them in the sky at this time of the year. And one of my favourites, the hypergiant Eta Carinae is somewhere in between Canopus and the Southern Cross. All these stars make the imaginary big wheel.
The sky looks almost devoid of stars anywhere inside my celestial Ferris wheel, with two exceptions. Let's split it in two with a diametral line that links the Alpha and Gamma Crucis, stars of the Southern Cross to lonely Achernar. On the same side as the pointers of the Southern Cross, you will find the Small Magellanic Cloud, a beautiful bright galaxy, that looks to the untrained eye (like mine) like a cirrus cloud hanging in space, 200,000 light years away. On the other side of the semicircle, another galaxy, the Large Magellanic Cloud compensates its loneliness by its size, from 150,000 light years away. These so called clouds that neighbour our galactic presence are visually two thirds away from the Southern cross and one third from Achernar. There is nothing else too bright within the big wheel, maybe because the wheel is inhabited by this giant spider, the Tarantula Nebula that has its nest inside the Large Magellanic Cloud. You can see its beautiful wisps through a telescope, although it is very faint. The tarantula nebula is a star-forming region, also known as 30 Doradus, and according to NASA is one of the largest star forming regions, located close to the Milky Way. About 2,400 massive stars in the center of 30 Doradus produce intense radiation and powerful winds as they blow off material into space.
While the Large Magellanic Cloud is enormous on a human scale, it is in fact less than one tenth the mass of our home galaxy. It spans just 14,000 light-years compared to about 100,000 light-years for the Milky Way and it is classified as an irregular dwarf galaxy. The ESO astronomers believe that its irregularity, combined with its prominent central bar of stars suggests to astronomers that tidal interactions with the Milky Way and fellow Local Group galaxy, the Small Magellanic Cloud, could have distorted its shape from a classic barred spiral into its modern, more chaotic form.
Crux, the Southern Cross, is no stranger to the northern hemisphere and it was entirely visible as far north as Britain in the fourth millennium BC. The Greeks could see it too but since then, the precession of the equinoxes, the wobble of Earth, its gyroscopic dance on the orbit has changed the skies a lot so that now Crux is only visible in the Northern Hemisphere from as far south as 25 degrees latitude north. Florida Keys, Puerto Rico, the islands of the Caribbean, as well as Hawaii are its northern limit of visibility. Near the Southern Cross, there is a dark patch of dust that masks the light that comes from the stars behind it and that is known as the coalsack. Inside the coalsack, the Jewel Box is one of my favourite sights that I visit over and over with the telescope.
Lower down on the path of the Milky Way the two pointers look now as if they are hanging from the Southern Cross. First comes Beta Centauri then the famous Alpha Centauri. For Maori they are also known in a different time of the year as the rope of an anchor. Here in Aotearoa, the Maori have three names for the same asterisms (groupings of stars) at different times of the year. What we know as Scorpius is now called Manaia Ki Te Rangi, the guardian of the skies. The messenger between the earthly world of mortals and the domain of the spirits, Mania also resembles to a seahorse and its symbol is used as a guardian against evil. Often you will see Maori people wearing a greenstone in Maori named pounamu Manaia as a taonga, a necklace.
Lower on the Horizon, at a magnitude of +0.95, red giant Antares shines as the brightest star in Scorpius. Right next to it, its rival, Ares by its Greek name, or Mars as we all know it better, is challenging the giant's red hue with its own red glimmer. This is how Antares got its name, as being the rival of Ares, Ant-Ares, the rival of Mars.
As the Milky Way splits the sky into two sectors, through the northeastern horizon runs the ecliptic, a lower arch, the plane of our solar system bearing the zodiacal constellations. They intersect the Milky Way right on the horizon. First to set on the western horizon, is Taurus and of it, just Aldebaran is left gleaming faintly as it passes beyond the edge of the world. The arch of the ecliptic climbs through Gemini, holder of the two bright stars Castor and Pollux, then higher up, Cancer is almost invisible to the untrained eye, a good peripheral vision training object. Leo, with the Royal Star Regulus is now host to the bright planet Jupiter, then comes Virgo with its bright star Spica, then Libra with Zubenelgenubi and Zubeneschamali the severed claws of Scorpius repurposed into a balance for Justice by the Roman Emperor Julius Caesar. Finally the arch curves down onto the western horizon where Scorpius with red Antares is carrying Red Mars. They appear around 10 PM followed by Saturn about forty minutes later. Mars will brighten steadily through the month as we catch up on it. Its distance shrinks from 118 million km away at the beginning of April to 88 million km away at the end of the month. It remains a small object in a telescope. According to our very own Alan Gilmore who received a lot fan mail about the subject, as probably did all of us, in the mid-month a telescope needs to magnify 130 times to make Mars look as big as the Moon does to the naked eye.
Saturn rises after 10:20 pm NZDT at the beginning of April; around 7:20 NZST by month's end. This also means that daylight saving starts soon and with it we will get an extra hour of sleep. Saturn is straight below Antares. If you have never seen Saturn through a telescope, the hunting season is about to open. A small telescope shows Saturn as an oval, the rings and planet blended. Larger telescopes separate the planet and rings and may show Saturn's moons looking like faint stars close to the planet. The best comment that I hear over and over from people looking through the telescope at Saturn for the first time after the ubiquitous wow is how much Saturn looks like... Saturn. Titan, one of the biggest moons in the solar system, orbits about four ring diameters from the planet. Saturn is 1400 million km away mid-month. Mercury might be seen setting in the bright twilight mid-month. It looks like a lone bright star on the northwest skyline.
This almost concludes our Night Sky South report for April 2016 but before I leave you with the peace of the night sky, I just want to quickly show you only two deep sky objects visually close to Jupiter, currently the luminary of the night sky. Jupiter is in Leo. Neighbouring Leo are Sextans and Hydra. Sextans is a "minor" equatorial constellation, a designation that made me smile. This constellation was actually invented by the famous stellar cartographer Johannes Hevelius to celebrate his sextant, a beloved instrument he used to map the sky. A copy of his famous maps adorns the ceiling of our beautiful library inside Space Place at Carter Observatory. Unknown to Hevelius, inside the celestial Sextant there is a bright galaxy NGC 3115, also known as the Spindle Galaxy. According to NASA, this field lenticular galaxy, several times bigger than the Milky Way, holds the nearest billion-solar-mass black hole to Earth whereas our supermassive black hole at the center of the Milky Way galaxy, called Sagittarius A, has a mass only equal to about 4 million suns.
The other object that I want to show you is inside the largest of the 88 constellations in the sky, Hydra, and close to the current position of Jupiter. The remains of a dying star form a planetary nebula called NGC 3242 and nicknamed "The Ghost Of Jupiter". A planetary nebula is a slowly dying star, a star that is not too big not too small, anything say in the range of 0.8 - 8 solar masses. Planetary nebulae are beautifully coloured and it is believed that they may play a crucial role in the chemical evolution of the Milky Way, blowing out their chemical elements to the interstellar medium. Now these are the same chemical elements that make our bones, construct our skin, and basically are both the building bricks of who we are and what keeps us alive. And all these chemical elements we have on Earth have all been through the hearts of stars. I get many comments a lot of times from people telling me how small and daunted, dwarfed and insignificant they feel when they look at the stars. And that they deliberately avoid looking up. It took me many years to get my head around this but when I look up to the sky, I know for sure that I am made of stardust, and that makes me glow every day.
From Space Place at Carter Observatory here in the southern hemisphere I wish a you clear and dark skies so that we can always see the stars and remember that we are made of the same stars dust as they are.
Special Thanks go to the amazing Rhian Sheehan, Peter Detterline, Chief Astronomer of the Mars Society, Alan Gilmore from University of Canterbury and to Toa Nutone Wii Te Arei Waaka from the Society for Maori Astronomy and Traditions.
- March 2016: The night sky for March 2016 [MP3]
- February 2016: The night sky for February 2016 [MP3]
- January 2016: The night sky for January 2016 [MP3]
- December 2015: The night sky for December 2015 [MP3]
- November 2015: The night sky for November 2015 [MP3]
- October 2015: The night sky for October 2015 [MP3]
- September 2015: The night sky for September 2015 [MP3]
- August 2015: The night sky for August 2015 [MP3]
- July 2015: The night sky for July 2015 [MP3]
- June 2015: The night sky for May 2015 [MP3]
- May 2015: The night sky for May 2015 [MP3]
- April 2015: The night sky for April 2015 [MP3]
- March 2015: The night sky for March 2015 [MP3]
- February 2015: The night sky for February 2015 [MP3]
- January 2015: The night sky for January 2015 [MP3]
- December 2014: The night sky for December 2014 [MP3]
- November 2014: The night sky for November 2014 [MP3]
- October 2014: The night sky for October 2014 [MP3]
- September 2014: The night sky for September 2014 [MP3]
- August 2014: The night sky for August 2014 [MP3]
- July 2014: The night sky for July 2014 [MP3]
- June 2014: The night sky for June 2014 [MP3]
- May 2014: The night sky for May 2014 [MP3]
- April 2014: The night sky for April 2014 [MP3]
- March 2014: The night sky for March 2014 [MP3]
- February 2014: The night sky for February 2014 [MP3]
- January 2014: The night sky for January 2014 [MP3]
- December 2013: The night sky for December 2013 [MP3]
- November 2013: The night sky for November 2013 [MP3]
- October 2013: The night sky for October 2013 [MP3]
- September 2013: The night sky for September 2013 [MP3]
- August 2013: The night sky for August 2013 [MP3]
- July 2013: The night sky for July 2013 [MP3]
- June 2013: The night sky for June 2013 [MP3]
- May 2013: The night sky for May 2013 [MP3]
- April 2013: The night sky for April 2013 [MP3]
- March 2013: The night sky for March 2013 [MP3]
- February 2013: The night sky for February 2013 [MP3]
- January 2013: The night sky for January 2013 [MP3]
- December 2012: The night sky for December 2012 [MP3]
- November 2012: The night sky for November 2012 [MP3]
- October 2012: The night sky for October 2012 [MP3]
- September 2012: The night sky for September 2012 [MP3]
- August 2012: The night sky for August 2012 [MP3]
- July 2012: The night sky for July 2012 [MP3]
- June 2012: The night sky for June 2012 [MP3]
- May 2012: The night sky for May 2012 [MP3]
- April 2012: The night sky for April 2012 [MP3]
- March 2012: The night sky for March 2012 [MP3]
- February 2012: The night sky for February 2012 [MP3]
- January 2012: The night sky for January 2012 [MP3]
- December 2011: The night sky for December 2011 [MP3]
- November 2011: The night sky for November 2011 [MP3]
- October 2011: The night sky for October 2011 [MP3]
- September 2011: The Night sky for September 2011 [MP3]
- August 2011: The Night sky for August 2011 [MP3]
- July 2011: The Night sky for July 2011 [MP3]
- June 2011: The Night sky for June 2011 [MP3]
- May 2011: The Night sky for May 2011 [MP3]
- April 2011: The Night sky for April 2011 [MP3]
- Abril 2011: El Cielo Nocturno de Abril 2011 [MP3]
- March 2011: The Night sky for March 2011 [MP3]
- February 2011: The Night sky for February 2011 [MP3]
- January 2011: The Night sky for January 2011 [MP3]
- December 2010: The Night sky for December 2010 [MP3]
- November 2010: The Night sky for November 2010 [MP3]
- October 2010: The Night sky for October 2010 [MP3]
- September 2010: The Night sky for September 2010 [MP3]
- August 2010: The Night sky for August 2010 [MP3]
- July 2010: The Night sky for July 2010 [MP3]
- June 2010: The night sky for June 2010 [MP3]
- May 2010: The night sky for May 2010 [MP3]
- Spring 1990: The night sky for April 2010 [MP3]
- March 2010: The night sky for March 2010 [MP3]
- February 2010: The night sky for February 2010 [MP3]
- January 2010: The night sky for January 2010 [MP3]
- December 2009: The night sky for December 2009 [MP3]
- November 2009: The night sky for November 2009 [MP3]
- October 2009: The night sky for October 2009 [MP3]
- September 2009: The night sky for September 2009 [MP3]
- August 2009: The night sky for August 2009 [MP3]
- July 2009: The night sky for July 2009 [MP3]
- June 2009: The night sky for June 2009 [MP3]
- May 2009: The night sky for May 2009 [MP3]
- April 2009: The night sky for April 2009 [MP3]
- March 2009: The night sky for March 2009 [MP3]
- February 2009: The night sky for February 2009 [MP3]
- January 2009: The night sky for January 2009 [MP3]
- December 2008: The night sky for December 2008 [MP3]
- November 2008: The night sky for November 2008 [MP3]
- October 2008: The night sky for October 2008 [MP3]
- September 2008: The night sky for September 2008 [MP3]
- August 2008: The night sky for August 2008 [MP3]
- July 2008: The night sky for July 2008 [MP3]
- June 2008: The night sky for June 2008 [MP3]
- May 2008: The night sky for May 2008 [MP3]
- April 2008: The night sky for April 2008 [MP3]
- March 2008: The night sky for March 2008 [MP3]
- February 2008: The night sky for February 2008 [MP3]
- January 2008: The night sky for January 2008 [MP3]
- December 2007: The night sky for December 2007 [MP3]
- November 2007: The night sky for November 2007 [MP3]
- October 2007: The night sky for October 2007 [MP3]
- September 2007: The night sky for September 2007 [MP3]
- August 2007: The night sky for August 2007 [MP3]
- July 2007: The night sky for July 2007 [MP3]
- June 2007: The night sky for June 2007 [MP3]
- May 2007: The night sky for May 2007 [MP3]
- April 2007: The night sky for April 2007 [MP3]
- March 2007: The night sky for March 2007 [MP3]
- February 2007: The night sky for February 2007 [MP3]
- January 2007: The night sky for January 2007 [MP3]
- December 2006: The night sky for December [MP3]
- November 2006: The night sky for November [MP3]
- October 2006: The night sky for October [MP3]
- September 2006: The night sky for September 2006 [MP3]
- August 2006: The night sky for August [MP3]
- July 2006: The night sky for July 2006 [MP3]
- June 2006: The night sky for June 2006 [MP3]
- May 2006: The night sky for May 2006 [MP3]
- April 2006: Night sky for April 2006 [MP3]
- March 2006: Night sky for March 2006 [MP3]
- February 2006: Night sky for February 2006 [MP3]
- January 2006: Night sky for January 2006 [MP3]
The Night Sky This Month is one part of the Jodcast. The full show contains the latest news, interviews with astronomers, answers to listener questions and more.