Agnihotra timing — why the exact half-disc sunrise matters

What zero time is

Zero time is the instant at which half of the Sun's disc stands on the horizon — the centre of the Sun exactly on the horizon line. That is the Vedic definition of sunrise and sunset, and it is the moment Agnihotra is tuned to. The two āhutis belong inside the twenty-four seconds that follow it.

Why the almanac time is different

The sunrise printed in newspapers and shown by phones is the moment the upper edge of the Sun first appears, and it includes the bending of light by the atmosphere, which lifts the Sun's image by about half a degree. Both conventions together put the almanac sunrise two to four minutes earlier than the Vedic one, and the almanac sunset the same amount later. Four minutes is far outside the Agnihotra window.

How this clock computes it

The Swara Yoga master engine computes the Sun's position from the Swiss Ephemeris for your latitude, longitude and time zone, and finds the instant the disc centre crosses the true horizon with no refraction correction. The clock fetches today's and tomorrow's times and counts down in real time; the 24-second window and every phase of the ceremony are measured from that instant. Nothing is estimated in the browser.

Your position matters to the second. Moving ten kilometres east or west shifts sunrise by about forty seconds; a hundred metres of elevation shifts it by about a minute, which is why the engine uses the true horizon rather than a hilltop view. Allow the clock to use your current location, or enter the place by hand.

The 24-second window

The offerings are made at the transition, not after it. Twenty-four seconds is a practical rule that the tradition at Swara Yoga Peeth keeps: enough for two calm mantras, short enough that the fire still meets the Sun on the line. The clock rings a bell three seconds before zero, shows the first mantra at zero and the second after twelve seconds.

Travelling and time zones

Zero time belongs to the place, not to the watch. When you travel, set the new place in the clock; the countdown follows the local horizon. The clock stores your location once and uses the same place for every daily feature of Swara Yoga.