Lagadha and the Clock for the Sacrifice

The fire is ready before sunrise, and the priest's question is a date. Has the bright fortnight of Magha begun? Is the Moon in the star the rite names? A career, a marriage, a child's temperament: none of that is on the ground in front of him. The offering has a window, and the window is in the sky.

The oldest Indian book that works this way is the Vedanga Jyotisha, preserved under the name of Lagadha. It comes in two recensions, one attached to the Rigveda and one to the Yajurveda. The Rig text opens with a bow, and the speaker says he will set out Lagadha's knowledge of time. The purpose is written into that opening. The knowledge is for the moments of the sacrifice.

A five-year wheel

The calendar runs on a yuga of five solar years. In that span the text counts 62 lunar months, 1,830 civil days, and 1,860 tithis, with two intercalary months so the Moon's year can catch the Sun. Five times 366 is 1,830. The roundness is the scheme. The sky is less tidy than the scheme, which is why a tithi has to be dropped on a regular count. The yuga contains more tithis than days.

The wheel is said to start when the Sun and the Moon stand together at Shravishtha, the star later lists call Dhanishtha, at the winter solstice, as the bright half of Magha begins and the Sun's northward course starts. That is a star position. Later Indian calendars put the same winter solstice in Shravana, the nakshatra to the west. The rite's clock had walked.

The text also gives the longest day as one and a half times the shortest. That ratio fits the latitude of the northwest of the subcontinent.

Two dates, kept apart

Scholars separate two clocks of their own. The solstice sitting at the start of Dhanishtha matches a sky many centuries before the Common Era, often placed around 1400 to 1200 BCE. The wording of the copies we have is generally put later. Keep both. The star is the text's own claim about the sky. The century of the sentences is a question about scribes.

There is no ascendant in this book, and no dasha. Jyotisha here is one of the six limbs of the Veda, and the text pictures it at their head the way a crest sits on a peacock. The limb tells a priest when. A birth chart is a later use of the same sky. If the question in front of you is a person, a Kundli starts from a birth time. Lagadha was starting from a sacrificial day.

Questions people keep asking

Is the Vedanga Jyotisha a horoscope manual?

It is a lunisolar calendar for ritual dates: the solar year, the lunar month, the tithi, the nakshatra, and the Sun's northward and southward halves. Natal prediction is a different literature.

Did Lagadha write every line we have?

The book is given under his name. The Rig recension has a speaker who says he is explaining Lagadha's knowledge of time. The name is the tradition's author. The opening is a frame of teaching.