Tithi

Tithi is known as a lunar day. It is defined that Moon moves away from the conjunction of New Moon and the Sun at 12 degree per day. One tithi is from one sunrise to sunrise of the next day. A lunar month has thirty tithis and each tithi is shorter than a solar day. Each month is divided into two pakshas. One is Shukla (bright half) and another is Krishna (dark half).