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Vedanga Jyotisha of Lagadha is the most ancient scripture for the determination of `Kala` (time). Western scholars had also shown interest on Astrology in Vedanga Period for understanding the precession of solstices. Scientific methods of calendar calculation for practical use have been mentioned in Astrology in Vedanga Period. Vedic Yajnas, such as, Agnyadhana, Darshapurnamasa, Chaturmasya, Nirudha pashubandha, Somayaga should be performed at specific time of the year, which is determined by Vedanga Jyotisha of Lagadha.

Astrology during the Vedanga period is quite scientific as it is based on actual position of the Sun and Moon. As Vedanga Jyotisha is the only genuine book for all Vedic purposes, other works on astrology including Surya Siddhanta are only acceptable as far as they are in line with Vedanga Jyotisha. In Vedic calendar system, a date consists of a time period of a day and the subsequent night. A fortnight consists of fourteen or fifteen tithis. A month consists of such two fortnights. A ritu consists of such two months. An ayana consists of such three ritus. And a year consists of such two ayanas. And finally a yuga consists of five years. It appears as the seventh month of an ayana. Vedanga Jyotisha strictly follows this natural phenomenon.

This method is completely scientific and according to the natural phenomena. The system of Vedanga Jyotisa has no such fault. In Vedic astronomical system, there are six seasons namely Shishira, Vasanta, Grishma, Varsha, Sharat and Hemanta. These seasons change with the movement of the Sun and the Moon. Shishir Ritu remains from Tapashshukla Pratipda to Tapasyakrishna Amavasya. Each Vedic season begins at Shukla Pratipada and ends by Krishna Amavasya It was during the Vedanga Jyotisha period that calculation of solar months, calendar, accurate planetary positions, the fixation of Lagna, as well as the basic knowledge about horoscope were developed. We follow the principles laid down by Maharishi Jaimini and other great masters of Vedic Astrology.

Vedanga Jyotisha is called eye – the organ of sight, of the Veda Purusha. The object of Jyotisha Vedanga is not to teach astronomy, but to convey such knowledge of the heavenly bodies as is necessary for fixing the days and hours of the Vedic sacrifices. It gives some rules for calculating and fixing time for sacrifices. In the Brahmanas and Aranyakas, we find frequent allusions to astronomical subjects, and even in the hymns we find traces which indicate a certain advance in the observation of the moon.It is unfortunate that there is no work available at present dealing with ancient Vedic astronomy (Jyotisha) in the Sutra style.

Only we have a small text-book called Jyotisha of Vedic astronomy in verses in two recessions. Generally, Maharshi Lagadha is regarded author of this Vedanga Jyotisha. This is a very difficult text and, therefore, is not clear on several points to scholars even today. Later, we find many Sanskrit treatises on astronomy and mathematical calculations. Bhaskaracharya, Varahamihira and Aryabhatta are known ancient scholars conversant with these scientific subjects. The principles established by them are in use in the modern world. We follow the principles laid down by Maharishi Jaimini and other great masters of Vedic Astrology.