I was interested in GPT-4's explanation of sidereal astrology, he came out with a pretty basic answer
Sidereal astrology is a system of astrology that uses the sidereal zodiac, which is based on the actual positions of the stars in the sky. In contrast, tropical astrology, the most commonly practiced form of astrology in the Western world, uses the tropical zodiac, which is based on the position of the sun relative to the earth.
The sidereal zodiac is divided into 12 equal parts, each corresponding to a specific constellation in the sky. The starting point of the sidereal zodiac is the fixed star Spica, which is located in the constellation Virgo.
In sidereal astrology, a person's birth chart is created based on the position of the planets and other celestial bodies at the time of their birth, using the sidereal zodiac. This can lead to different placements and interpretations of the planets than in tropical astrology.
Sidereal astrology is primarily practiced in India and is also used by some astrologers in the Western world who prefer its focus on the actual positions of the stars in the sky. However, it is not as widely used or recognized as tropical astrology.