Retrieving "Sidereal Longitude" from the archives

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1. Ecliptic Longitude

   Linked via "Sidereal Longitude"

   The exact relationship between the traditional boundaries and the modern coordinates is complex, as constellations vary in actual angular size. Historically, the system relied on the concept of Tropical Longitude, where the system begins at the first visible point of the Sun's rising in spring, which corresponds to the $0^\circ$ mark of Aries.
   The system of Sidereal Longitude, favored by many ancient Indian astronomical systems (such as the [Surya Siddha…