adjective relating to or determined by the stars; astronomical
In astronomy, sidereal is used to refer to the stars and their positions relative to Earth's rotation.
In astrology, sidereal is used to calculate the positions of planets and stars based on the fixed stars.
In navigation, sidereal time is used to determine the position of celestial objects for navigation purposes.
In astrophysics, sidereal time is used to measure time based on the rotation of the Earth relative to distant stars.
In astrology, a writer may use the term 'sidereal' to refer to the zodiac system that is based on the fixed stars, as opposed to the tropical zodiac which is based on the position of the Sun.
A psychologist may use the term 'sidereal time' when discussing circadian rhythms and the body's internal clock, which is based on the rotation of the Earth relative to the fixed stars.
An astronomer may use 'sidereal day' to refer to the time it takes for a specific star to return to the same position in the sky, which is slightly shorter than a solar day due to the Earth's orbit around the Sun.
In astrology, an astrologer may use 'sidereal astrology' to refer to the practice of using the fixed stars as reference points for interpreting planetary positions and their influence on individuals.