✦ Astro Events

One timeline for every event by year — transits, moons, retrogrades, solstices, eclipses, Kumbh Melas, Adhik & Kshay Maas and Kaal Sarp windows.

🌑 Lunapedia

Everything about every moon — distance, ecliptic latitude, and cultural names.

🗓 Sayan vs Nirayan

Compare tropical and sidereal Hindu month names across years.

📖 Nirukta · निरुक्त

Words from the Sky — a Sanskrit astronomy glossary: the roots behind gola, ayana, graha, rāśi and kāla, and their Greek, Latin & English cousins.

🕐 Kālgaṇanā

Learn how Panchang is calculated from the positions of Sun and Moon.

🧮 Ahargaṇa

Step-by-step count of civil days from Kaliyuga — Sūrya Siddhānta, Āryabhaṭīya & Grahalāghavam.

📜 Vedang Jyotish Yuga

The 5-year luni-solar cycle from India's oldest astronomical text — 60 solar & 62 lunar months.

🗺 Lagna Rashi Map

Interactive world map of places sharing the same rising zodiac — same Lagna, same Kundali — at any date & time.

◉ Sphuṭa Graha · Epicycles

Drag the mean planet and its ucca to watch manda & śīghra epicycles turn a madhyama graha into a true longitude — with Sūrya Siddhānta and Siddhānta Śiromaṇi paridhis.

📐 Jyā & Koṭi-Jyā

Watch sine, cosine and versine emerge as half-chords of a circle — the Jyā, Koṭi-Jyā and Utkrama-Jyā of Indian trigonometry.

🏔 Kaalmeru · कालमेरु

Every unit of Hindu time raised as a mountain — from Truti, too brief to perceive, to the Mahākalpa, Brahmā's 311-trillion-year life. Each step is ten times the one above.