Check our website each month to download free star charts for night sky exploring. These simple star charts will help beginners recognise the major landmarks of the night sky and follow the motions of the bright planets. Click the month to download the pair of star charts – one looking east, the other west.
These simple star charts will help beginners recognise the major landmarks of the night sky and follow the motions of the bright planets. There is a pair – one looking east, the other west – for each month.
The star charts show two views of the night sky for each month. One view shows the western sky and the other shows the eastern sky. A small piece of the northern and southern sky is not shown so we can show you a better scale for the charts.
To match the chart to the western sky, hold the western chart with the ‘WEST’ label aligned with west on your horizon. Be aware that hills, trees and buildings may well block your view of objects nearer the horizon. Also, because of city lights and the absorbing effect of the Earth’s atmosphere, objects nearer the horizon will generally appear fainter and redder – an effect we are all familiar with when watching the setting of the Sun or Moon.
Each chart will match the sky at the times given in the table on each page. Locating the ‘Overhead’ marker for each chart will help with orienting your view of the sky. The other key marker is labelled ‘SCP’ – the South Celestial Pole. The whole sky seems to rotate around this point so objects close to the SCP will never set – they are called ‘circumpolar’. The elevation above your horizon measures your latitude. These charts are done for the latitude of Auckland (37-degrees south). From Invercargill, the SCP will appear nearly 10degrees higher in the south so more of the southern sky will be circumpolar from there.The Southern Cross never sets anywhere in Aotearoa so is perpetually in our skies, even though in the very north of the country it nearly touches the southern horizon.
The thin black line stretching across the charts is called the ‘ecliptic’. This marks the annual path of the Sun over the year and it is also the plane of the Solar System. The planets are always found along the ecliptic and are marked on the charts. By checking all the charts, you can follow the motions of the planets against the stars over the year.
The size of the stars on the charts indicates the approximated brightness of each star. However, this is not true for the planets. For example, the planets Uranus and Neptune are shown even though they are too faint to see without binoculars or a telescope.
Only the most prominent constellations are shown to avoid unnecessary clutter.
Because the planets move against the stars over the course of the year, the positions shown for them is only exactly right for date of the ‘mid-month’. For Saturn and Jupiter that move slowly, their positions are quite good. However, Mercury, Venus and Mars move quite quickly relative to the stars, so their positions on the charts can be somewhat different. The planet positions shown are correct for the mid-month time for each month respectively. For example, on the ‘JANUARY- WEST’ chart, the positions of the planets are calculated for mid-January at 10pm
The nights are getting longer and cooler as we pass the autumn equinox. Orion, the dominant constellation of summer, is moving off the celestial stage, chased by the cooler but rich constellations of Scorpius and Sagittarius.
By mid-April the sky has moved around and the summer landmark, Orion is now setting in the early evening followed soon after by the ‘Dog Star’, Sirius. Looking north, there are a series of zodiac constellations with familiar names dating back to antiquity.
From west to east you can see Gemini, marked by the two bright stars, Pollux and Castor, low in the northwest. Cancer (the Crab) is quite inconspicuous and hard to pick out if you are competing with city lights or bright moonlight.
On the other hand, Leo, the next constellation moving west to east, is easy to pick out because of its bright, orange star, Regulus. East of Leo lies Virgo, which this year includes planet Jupiter, far outshining Virgo’s brightest star, Spica. Spica is brilliantly white indicating that it’s much hotter than our Sun. Above Spica and Jupiter there is a conspicuous quadrilateral marked by four stars forming a handy signpost; this is the constellation of Corvus (the Crow).
This procession of constellations will cross the northern sky from east to west as the night goes on, followed later by Libra, Scorpius and Sagittarius.
Turning to the southern sky, the key landmark to locate is Crux (the Southern Cross), the iconic constellation of the Southern Hemisphere. At this time of year face south and look up high and you should pick it out without difficulty. Just to be sure, check that the two bright stars of Centaurus (commonly called the Pointers) are pointing to the top of the Cross. In mid-autumn around midnight, Crux and Centaurus are at their highest point above the southern horizon.
Following an imaginary line up the sky from the Pointers and on through Crux, you will find the constellations of Carina, Vela and Puppis. There are a number of different patterns you will come to recognise here but most people pick out the distinctive shape of the False Cross. It isn’t a real constellation but its pattern is so obvious that astronomers call it an asterism. It consists of two stars from Carina and two from Vela, all having roughly equal brightness. The brightest star in Carina is the brilliant Canopus. It is the second brightest star, second only to Sirius and the most luminous star within 700 light-years.
Continue the imaginary line past the False Cross, following the centre of the Milky Way and you find the large constellation of Puppis. While this isn’t a household name, it is quite bright and passes overhead in New Zealand.
This trio of important southern constellations – Carina, Vela and Puppis – once made up a single, huge constellation called Argo Navis (the mythical ship of Jason and the Argonauts). Argo Navis was created in the 2nd Century but in the 17th Century it was divided into three smaller more manageable constellations.
At this time of year if you can see the autumn night sky on a moonless night away from city lights, you can easily pick out the disc of our galaxy – The Milky Way – looking like a ghostly cloud stretching across the sky. It is the combined light of some of the estimated 200 billion stars that make up our galaxy, running from the southeastern horizon passing through the Pointers, Crux, Carina, Vela and Puppis and on across the sky passing between Orion and Gemini in the northwest.
The best opportunities to observe Mercury are around 2 April in the western sky soon after sunset and then around 18 May in the east just before dawn.
Venus emerges from the Sun’s glare rising just before the Sun by early April. It reaches maximum brightness in the pre-dawn eastern sky on 28 April and continues to rise earlier and be well placed for observing through late May.
Sets soon after the Sun in the northwest and is very hard to spot in the twilight.
Jupiter is rising in the early evening and reaches opposition (rising at sunset) on 8 April, making it ideally placed for viewing through a telescope around midnight. On 12 April the Moon joins Jupiter and Spica. By May, Jupiter is well placed for viewing from the end of twilight.
From March, Saturn is high in the north and is well placed for viewing before dawn. Through April and May, Saturn rises earlier and will provide outstanding views in cool hours before midnight. Over the next few years Saturn will be slowly crossing the dense star fields of the heart of the Milky Way.