Night sky is a commonly used term most often employed to refer to the sky as it is seen at night. The term is usually associated with an astronomy or related context, with reference to view of stars, the Moon and planets that become visible on a clear night after the Sun has set.

The night sky and studies of it have an historical place in both ancient and modern cultures. In the past, for instance, farmers have used the state of the night sky as a calendar to determine when to plant crops. Many cultures have drawn constellations between stars in the sky, using them in association with legends and mythology about their deities.

The anciently developed belief of astrology is generally based on the belief that relationships between heavenly bodies influence or convey information about events on Earth. The scientific study of the night sky and bodies within it, meanwhile, takes place in the science of astronomy.

See also

• Amateur astronomy
• Astrology
• Astronomical object
• Constellation
• Planetarium