Astronomical Fasts & Observances
The astronomical principles behind sacred fasting days and cosmic cycles: Ekadashi, Pradosham twilight, Amavasya, Pournami, and Sankatahara Chaturthi.
Ekadashi Fasting & Parana: The 11th Lunar Phase Science
How the 120°–132° lunar elongation defines the Ekadashi fast, the Harivasara rule, and the morning Parana break-fast window.
Pradosham Explained: The Sacred Sunset Twilight Window
The astronomical calculation of the 3.75 Ghatika (90-minute) sunset sandhya on Trayodashi tithi, harmonizing Sri Lakshmi Narasimha twilight prayers and Shiva-Nandi worship.
Amavasya & Pournami: The Astronomical Extremes of Lunar Syzygy
New Moon conjunction (0°) vs Full Moon opposition (180°): ocean tides, moonlit traditions, and ancestral tharpanam timing.
Sankatahara Chaturthi: The Moonrise Calculation Mystery
Why Sankatahara Chaturthi depends strictly on Moonrise during Krishna Chaturthi, leading to different calendar dates across cities.
Thai Pongal & Makara Sankranti: Solar Ingress, Science & Rituals
The astronomical science of the Sun entering Makara Rasi, the sacred moment of Pongal boiling, and practical diaspora adaptations.
Puthandu (Tamil New Year): Mesha Sankranti, Vishu Kani & Rituals
The astronomical science of the Sun entering 0° Aries, the sacred dawn Vishu Kani viewing, and the philosophy of 6-taste Mangai Pachadi.
Deepavali & Ganga Snanam: Arunodaya Oil Bath, Science & Rituals
Why Tamil Deepavali is celebrated at pre-dawn Arunodaya (Krishna Chaturdashi), the sacred oil bath invokes Lakshmi and Ganga, and the role of Deepavali Marundhu.
Karthigai Deepam: Cosmic Pillar of Fire, Krittika Star & Agal Vilakku
The astronomy of Karthigai Pournami and the Krittika star (Pleiades), home lamp arrangements, and Tiruvannamalai Maha Deepam.
Tamil Festivals & Sacred Observances: The Master Nirnaya Guide
Solar sankrantis, nakshatra alignments, and dawn/sunset tithi vyapti: cultural significance, checklists, recipes, and modern diaspora adaptations for all 16 major Tamil festivals.
Your City’s Panchangam, Every Day
Many printed calendars are computed for one town. Nava Panchangam computes sunrise, sunset and the windows that depend on them, such as Rahu Kalam, for your city, with a choice of Vakya or Drik; a tithi’s ending instant is the same everywhere.
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