The Celestial Sphere from Latitude 45° North

2300 Hours Sidereal Time

The sky from 45°N at 2300 hours sidereal time

This page contains a description of the stars, constellations, and deep-sky objects that can be seen in the sky at around 2300 hours sidereal time. It is assumed that the observer is located at approximately 45° latitude north.

To use the sky map, orient it so that the direction you are facing is at the bottom of the map. Zenith, the point directly overhead in the sky, is located at the centre of the map.

Looking North

Hercules is swinging around to the northwest, dragging Lyra with its bright Vega in its wake. Look closely within the 'Keystone' of Hercules for the naked-eye globular cluster M13. Corona Borealis is on the horizon in the northwest and difficult to see.

Ursa Major is also skirting the horizon, albeit in the north. Use the two stars at the end of the dipper of the 'Big Dipper' to point upwards to Polaris in Ursa Minor. Draco can be found lurking between the two dippers.

Above the 'Little Dipper' is Cepheus and just to the east is Cassiopeia, an M-shaped constellation high in the north. Climbing higher into the sky is Perseus which follows Cassiopeia across the northern skies. The bright star in the northeast is Capella in the pentagonal Auriga. Also making its appearance in the east is the wintertime constellation of Taurus. The brightest star in this member of the zodiac is Aldebaran but the constellation of the bull has another famous member: the Pleiades open star cluster can be found just above Aldebaran.

Looking South

Other than Taurus, the east and southeast are devoid of bright objects. Cetus takes up most of the southeastern sky with the zodiacal constellations of Aries and Pisces located above. However, this is the prime time for viewing Andromeda and Pegasus which are close to zenith. Pegasus is easy to locate by its 'Great Square' and Andromeda is attached to this square of stars at the upper left-hand side. The Andromeda Galaxy or M31 is a spiral galaxy located approximately 2.5 million light years away and is the farthest object that can be seen with the naked eye.

Aquarius is now due south. The bright star Formalhaut in Piscis Austrinus is due south and very low. Another watery constellation, the triangular Capricornus, is also located below Aquarius.

The 'Summer Triangle' of Deneb, Vega and Altair has moved into the west and northwest. Deneb is the brightest star in Cygnus, also known as the 'Northern Cross', whilst Altair can be found in Aquila. Tiny Delphinus, a kite-shaped figure just to the left of the 'Summer Triangle' is also easy to spot.