Sidereal (adjective)

Relating to the stars or celestial objects and their positions or movements in relation to the fixed stars.

Origin:

The word sidereal originated in the late 17th century, from the latin word "sideralis" which means "of the stars" and comes from "sider-" meaning "star". it refers to the stars or celestial objects and their positions or movements in relation to the fixed stars.

Examples:

1. The sidereal time is the time measured by the position of the stars.
2. A sidereal year is the time it takes for the Earth to complete one orbit around the sun with respect to the fixed stars.
3. The sidereal day is the time it takes for one rotation of the Earth with respect to the stars.
4. The sidereal zodiac is the zodiac that is based on the fixed stars.
5. He was an expert in sidereal astrology and studied the positions of the stars to make predictions.