Muhurta
The meditation window before dawn — for every day of the year. Pick your country and city: the time is counted from the real sunrise at your place.
The whole year
What this is. In the Vedic reckoning the day runs from sunrise to sunrise and is divided into thirty muhurtas of forty-eight minutes each. Brahma muhurta is the second to last muhurta of the night: it begins one hour thirty-six minutes before sunrise and ends forty-eight minutes before it. This window is held to be the best time for meditation and practice. It is tied to sunrise rather than to the clock, so it drifts with the season and the latitude.
The second count is proportional: the night is divided into fifteen parts, so the muhurta stretches in winter and shrinks in summer. At the equinox both counts agree; towards the solstices they part. The canonical forty-eight-minute count is taken as the main one — it holds at any latitude.
Accuracy. Sunrise is computed for the upper limb of the solar disc with refraction, as in almanacs; the difference from astronomical ephemerides is under three minutes. Daylight saving is handled automatically. The year itself barely matters: the same date varies by one or two minutes. Above the polar circle, on days when the sun neither rises nor sets, there is no window — the page says so instead of printing invented figures.