In this episode, we will discuss the difference between sidereal and tropical zodiac systems used in Indian and Western astrology respectively. The sidereal zodiac is based on stars and the tropical zodiac is based on the sun's position. We will also cover the precession of the equinoxes, which causes the spring equinox to move along the orbit and creates a difference between these two zodiacs over time. 

Bibliography:

Campion N. (2012). A History of Western Astrology. A&C Black.

O'Connell, P. J. (2015). The Sidereal and Tropical Zodiacs: An Historical Survey. Culture and Cosmos, 19(2), 7-29.

Rao, K. N. (2010). Astrology for Beginners: B.V. Raman. Motilal Banarsidass Publishers.

Lahiri, S. (2008). Lahiri's Indian Ephemeris Of Planets' Positions: According To The ‘Nirayana' Or Sidereal System For 2002 A.D. To 2020 A.D. Motilal Banarsidass Publishers.

Topic: History of India | Astronomy | Astrology