These websites provide a comprehensive and accurate Panchangam for various years, including 1999.

The following dates are based on solar and lunar positions as recorded in the 1999 Tamil calendar: Date in 1999 Tamil Month/Detail January 14 1st day of Thai Masi Magam Masi month Tamil New Year 1st day of Chithirai Chitra Pournami Full moon in Chithirai Agni Nakshatram May 4 – May 28 Peak summer period Vaikasi Visakam Vaikasi month Guru Purnima Auspicious day for Gurus Aadi Perukku 18th day of Aadi Aadi Amavasai No moon day in Aadi Avani Avittam August 25/26 Rig/Yajur Veda rituals Understanding Vakya Panchangam

A festival celebrated over four days, usually in mid-January, thanking the Sun God for the harvest.

Here is how the Vakya system calculated major festival dates in 1999:

The Tamil Vākya Pañcāṅgam is a unique sidereal solar-lunar calendar system based on ancient memorized vākyas (aphoristic numerical rules) rather than instantaneous gaṇita (mathematical computation). This paper analyzes the almanac for the year 1999 (Pramādi – Vikāri cycle year corresponding to 1999-2000 CE) to assess its predictive accuracy for solar ingress ( sankrānti ), tithi boundaries, and nakṣatra positions. Using the Sūrya Siddhānta as a baseline and modern astronomical ephemerides (JPL DE431) for validation, we find that the Vākya system maintains remarkable consistency for daily ritual purposes, with a mean error of under 1 hour in tithi calculation, though systematic drift accumulates over centuries.

Used for determining "Subha Muhurthams" (auspicious timings). 2. Major Planetary Transits (1999) This section reviews the major transits recorded in 1999: Jupiter (Guru) Transit: