Hindu calendar

The Hindu calendar, also called Panchanga (Sanskrit: पञ्चाङ्ग), is one of various that are traditionally used in the Indian subcontinent and Southeast Asia, with further regional variations for social and Hindu religious purposes. They adopt a similar underlying concept for timekeeping based on sidereal year for solar cycle and adjustment of lunar cycles in every three years, but differ in their relative emphasis to moon cycle or the sun cycle and the names of months and when they consider the New Year to start. Of the various regional calendars, the most studied and known Hindu calendars are the Shalivahana Shaka (Based on the King Shalivahana, also the Indian national calendar) found in the Deccan region of Southern India and the Vikram Samvat (Bikrami) found in Nepal and the North and Central regions of India – both of which emphasize the lunar cycle.

Quotes

 * They establish the consecration soma-pressings before(hand). They should consecrate themselves one day after the new moon of Taisa, or of Magha, so they say. Now, either (view) is widely proclaimed; but that of Taisa is more (commonly) proclaimed, as it were. They obtain this thirteenth, additional month. So great indeed is the year as this thirteenth month. So here the entire year is obtained.
 * Kausitaki (or Sankhayana) Brahmana. 19.2-3 quoted from Hans Henrich Hock. Philology and the historical interpretation of the Vedic texts, in: Bryant, E. F., & Patton, L. L. (2005). The Indo-Aryan controversy : evidence and inference in Indian history. Routledge. 296-7


 * He (the sun) rests at the new moon of Magha, about to turn northward; these (the priests) rest (too), about to sacrifice with the introductory atiratra; so they obtain him first . . . [A clear reference to the winter solstice, after which the sun “turns northward,” i.e. begins to rise farther and farther to the north each day] He goes northward for six months; him they follow with six-day sacrifices in correct order. Having gone north for six months, he stays, about to turn south; they rest, about to sacrifice with the vifuvat ( midsummer) sacrifice; so they obtain him a second time. [A clear reference to the summer solstice, after which the sun “turns south,” i.e. begins to rise farther and farther to the south each day] He goes south for six months; they follow him with six-day sacrifices in reverse order. Having gone south for six months, he stays, about to return north; they rest, about to sacrifice with the mahavrata sacrifice; so they obtain him a third time [a clear reference to the winter solstice again].
 * Kausitaki (or Sankhayana) Brahmana. 19.2-3 quoted from Hans Henrich Hock. Philology and the historical interpretation of the Vedic texts, in: Bryant, E. F., & Patton, L. L. (2005). The Indo-Aryan controversy : evidence and inference in Indian history. Routledge. 296-7