Hayanaratna 1.154

If the solar years of a kalpa (the great world-age) give the savana (sunrise-to-sunrise) days of a kalpa, how many for one year? So one year has these savana days: 365; 15; 31; 30. Only the weekday is needed, so sevens are cast out from the top. This gives 0 1; 15; 31; 30. Now a proportion. If one year has these savana days, how many do the years of life gone have? So multiply the years gone by this dhruva (fixed yearly figure), 0 1; 15; 31; 30, in four places. Divide by one. The result is the savana days counted from the time of birth. The birth weekday and the rest are added to this. This is done to know the day, ghatika (24-minute unit) and pala (24-second unit) of the year's entry. Here palas and ghatikas carry up by sixties into each higher place. The birth palas and ghatikas are never over sixty. So the days made are only to be cast out by seven. That is why 'cast out sevens' was said. When this is done, the year starts exactly on that day with its parts. So it is proved.

Simple meaning: Proof of the year figure: one solar year is 365 days 15 ghatikas 31 palas 30 vipalas. Less whole weeks it is 1;15;31;30.