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The word Panchangam translates to "five limbs," representing the five vital astronomical elements of a day: (lunar day), Vaara (weekday), Nakshatra (stellar constellation), Yoga (lunar-solar day), and Karana (half of a tithi).
Marked as Prathamai (1), Dwitiyai (2), up to Amavasai (New Moon) or Pournami (Full Moon).
For those seeking related Siddhanta or regional almanacs, the Sri Roudri Nama Samvatsara Panchamgam (1980-81) is hosted on the Internet Archive Key 1980 Observances Based on traditional calculations for 1980: Mahalaya Amavasya: October 9, 1980. Deepavali (Diwali): November 7, 1980. Chitra Pournami: May 30, 1980. Online Calendar Converters 1980 To 1981 Rowthri PDF - Scribd
Digitized editions of the authoritative Maruthuvakudi Vakya Panchangam for Rowthri Varusham (1980-1981) are hosted by community archivers on Scribd. These documents can be viewed via a free basic account.
Major shifts like Guru Peyarchi (Jupiter) and Sani Peyarchi (Saturn).