The Celestial Sphere from Latitude 45° North

1900 Hours Sidereal Time

The sky from 45°N at 1900 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 1900 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

The 'Big Dipper', part of the constellation Ursa Major, is beginning to swing below its compatriot Ursa Minor. The two stars marking the end of the bowl of the 'Big Dipper' point toward Polaris, brightest star in Ursa Minor. Making its way between Ursa Major and Ursa Minor is Draco. The 'lozenge' of stars outlining the dragon's head is never far from bright Vega.

High in the western sky, Boötes approaches the horizon. This constellation is shaped like a kite or perhaps an ice cream cone and Arcturus marks the base of the figure. Following in its wake is the half-circle of stars that make up Corona Borealis.

Cassiopeia, the W-shaped constellation on the other side of Ursa Minor from Ursa Major, is circling higher into the sky. Above it lies Cepheus and below, Perseus. The daughter of Cassiopeia and Cepheus is Andromeda. This constellation is just rising in the northeast. Within the boundaries of this constellation lies the farthest object visible to the naked eye, M31, the Andromeda Galaxy. This faint smudge is 2.5 million light years distant.

Looking South

Pegasus is lifting off of the eastern horizon, its 'Great Square' now easily seen. The constellation of Andromeda is attached to the flying horse at one corner of the 'Great Square'.

High overhead is the asterism known as the 'Summer Triangle'. This is comprised of three bright stars from three different constellations: Deneb from Cygnus, Vega from Lyra and Altair from Aquila. Cygnus is also known as the 'Northern Cross' because of its shape. Deneb marks the top of the cross and Albireo marks the bottom. Although not much to look at with the naked eye, Albireo resolves into a spectacularly-coloured binary with binoculars or a small telescope. Just east of Cygnus is the tiny constellation of Delphinus, its kite shape easy to see.

Just past Vega is the 'Keystone' of Hercules. Within this asterism can be found M13, the Great Globular Cluster, a spherical conglomeration of hundreds of aging stars. Corona Borealis and Boötes lie farther to the west.

The zodiacal constellations lie very near the horizon at this time. Just appearing above the southeastern horizon is Aquarius. Working westward, faint Capricornus is the next member of the zodiac to be found. Due south is the very bright Sagittarius, a teapot-shaped object. Scorpius is so close to the horizon that it is difficult to see. Its brightest star is Antares. Directly above the scorpion is the large but nondescript constellation of Ophiuchus through which the ecliptic also passes.