How astrology works, Rahu-Ketu, tropical zodiac vs sidereal zodiac, Ayanamsha, Vedic calendar, Chaturyuga and Mahayuga, extra and lost months, Saptarshis calendar, Graha Yuddha, Charakaraka, Saka year, Salivahana Saka, Vikram Smvat, Kali ...

970 BCE; proven by Kaliyuga, 13-day eclipse pair and Arundathi-Vasishta switch among other astronomical references.

එඩ්වඩ් අපම් ගේ "රාජරත්නාකරය" ඉංග්‍රීසි පරිවර්තනය ඇසුරිණි.