7 in Astronomy
The number of stellar objects in the solar system visible to the naked eye — the Sun, the Moon and the five classical naked eye planets: Mars, Mercury, Jupiter, Venus, and Saturn.
Messier object M7, a magnitude 3.5 open cluster in the constellation Scorpius.
The New General Catalogue object NGC 7, a 14th magnitude spiral galaxy in the constellation Sculptor.
The number of daughters of Atlas in the Pleiades (also called the "seven sisters").
The number of saints appearing in a constellation called "Saptharishi Mandalam" in Indian astronomy.
The number of stars in the constellation of Ursa major.
The Saros number of the solar eclipse series which began on -2590 April 8 and ended on -1310 May 16. The duration of Saros series 7 was 1,280.1 years, and it contained 72 solar eclipses.
The Saros number of the lunar eclipse series which began on -2595 July 15 and ended on -1008 February 22. The duration of Saros series 7 was 1,586.6 years, and it contained 89 lunar eclipses.
The Roman numeral VII stands for white dwarfs in the Yerkes spectral classification scheme.
The Roman numeral VII (usually) stands for the seventh-discovered satellite of a planet or minor planet (e.g., Jupiter VII).
