Mesopotamian water-clock in India (1)

Text
A post-Vedic Indian text employs a linear zig-zag function with a constant difference of one prastha a day to determine the amount of water to be poured into the water-clock for each period of daylight, with a minimum amount at the winter solstice, and the maximum amount at the summer solstice. The amount of water is the length of daylight itself, based on the Babylonian ratio 3:2 of the longest to the shortest day in the year, and unsuitable for latitudes in most of India.

Jyotiṣavedāṅga 7 (Ṛk Recension):
The increase in daylight and the decrease in night-time in the northern course (of the Sun) is a prastha of water, in he southern course it is the reverse. Six muhūrtas in an ayana.

Source (list of abbreviations)
Jyotiṣavedāṅga 7 (Ṛk Recension)

Bibliography

Amar Annus

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