15. Lunar fortnights and days.
Project Gutenberg EPUB3 edition
Russell, R. V. (Robert Vane)
The lunar month was divided into two fortnights called paksha or wing. The period of the waxing moon was known as sukla or sudi paksha, that is the light fortnight, and that of the waning moon as krishna or budi paksha, that is the dark fortnight.
Each lunar month was also divided into thirty equal periods, called tithis or lunar days. Since there are less than thirty days in the lunar month, a tithi does not correspond to an ordinary day, but begins and ends at odd hours of the day. Nevertheless the tithis are printed in all almanacs, and are used for the calculation of auspicious moments.15