Panchang — the five limbs of any day, for any place
Pick a date and a town. SIA computes the Sun and the Moon for that day with its own engine and reads the five limbs, the day’s windows and the vivāha calendar — the Panchang is free, in full, with an account.
Free with an account, in full — the Panchang is the one thing SIA gives away whole. You sign in on the next step; the date and place you chose come along.
How SIA reads a day
- Choose the date and the place above — sunrise and sunset, and so the day’s windows, depend on the place.
- SIA computes the Sun’s and the Moon’s sidereal longitudes for that day and derives the five limbs: tithi from their gap, nakṣatra from the Moon, yoga from their sum, karaṇa as the half-tithi, vāra from sunrise.
- Read the day: the five limbs with their timings, the choghaḍiyā and horā windows, and the vivāha-muhūrta verdict for the date.
What a panchang is
A pañcāṅga is the five limbs of a day: the tithi (the lunar day, one of thirty), the vāra (the weekday), the nakṣatra the Moon stands in (one of twenty-seven), the yoga (one of twenty-seven, from the Sun and Moon together) and the karaṇa (a half-tithi, one of eleven). Every one of them is arithmetic on two longitudes — the Sun’s and the Moon’s — for a given moment and place, which is why a panchang differs from town to town by the sunrise that starts its day.
SIA computes those longitudes with its own planetary engine — the Sūryasiddhānta’s steps, refined by an in-house series to a tenth of an arc-minute — on the Lahiri ayanāṃśa every standard panchang shares, so the limbs and their change-times agree with the printed almanacs and carry the verse that defines each of them.
The day’s windows, and what is śāstra
Below the five limbs SIA lays out the choghaḍiyā (eight windows of the day and eight of the night) and the horā (the planetary hours). These are labelled for what they are: an almanac tradition, not a classical rule — SIA’s one standing habit is that anything claiming the authority of the texts carries a verse id, and these do not, so they say so.
The vivāha-muhūrta verdict is the opposite case: it reads the wedding calendar from Muhūrta Cintāmaṇi — the months, the tithis and the nakṣatras it admits and forbids — and cites the verses it rests on. A person’s own tārā-bala and candra-bala for the day are read inside their kundali, on the Panchang tab, because those need a birth Moon.
Questions
Is the panchang free?
Yes — in full, with an account. It is the one part of SIA that needs no plan: any date, any place, the five limbs with their timings, the windows and the wedding-calendar verdict.
Why does the panchang change with the place?
The Hindu day runs from sunrise to sunrise, and sunrise depends on where you stand. The tithi, nakṣatra and yoga themselves barely move between towns; the times at which they change, and the windows of the day, follow the local sunrise and sunset.
Can I see a past or future date?
Any date. The Sun and Moon are computed for the day you pick, so a wedding month next year or a birth day decades ago reads the same way as today.
Is it available in Hindi?
Yes — every limb, window and verdict in Hindi or English, switchable at any time.
How is this different from the Panchang inside a kundali?
This page reads the day itself. The Panchang tab inside a kundali reads the same day through that person’s birth Moon — tārā-bala, candra-bala and the nine-graha weather — which needs the chart.