Astronomy Answers: The Starry Sky: 18:00 Hours Sidereal Time

Astronomy Answers
The Starry Sky: 18:00 Hours Sidereal Time

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This page shows the starry sky for 50° north latitude at 18 hours sidereal time. It is approximately 18 hours sidereal time at 18 hours local time at the end of September, at 12 hours local time at the end of December, at 6 hours local time at the end of March, and at 0 hours local time at the end of June.

The black disk indicates the sky, in stereographical projection. The circle at the outer edge of the disk is the horizon. The middle of the disk is the zenith. North is up, east to the left, south at the bottom, and west to the right. The white dots are stars of magnitude 3.5 and brighter. The larger the dot, the brighter the star.

The blue lines indicate the official boundaries of the constellations, with the official latin names also in blue.

The white line indicates the celestial equator (declination 0°) from the equatorial coordinate system. The red line indicates the ecliptic (ecliptical latitude 0°) from the ecliptical coordinate system. The ecliptic is the approximate path of the Sun, Moon, and planets. The purple line shows where the Milky Way is.

At 18 hours sidereal time the Big Dipper (part of the official constellation of the Great Bear [Ursa Major]) is to the west. The "W" of Cassiopeia is to the east. The Summer Triangle (made up of the star Deneb in the Swan [Cygnus], Vega in the Lyre [Lyra], and Altair in the Eagle [Aquila]) is in the southeast. The star Spica in the Virgin (Virgo) is very low in the southwest. The constellation the Scorpion (Scorpio) with the star Antares, and the constellation the Archer (Sagittarius) are low in the south. The star Arcturus in Bootes is to the lower left of the Great Bear. The Milky Way runs from the north high through the east to the south.


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Last updated: 2021-07-19