What is Abhijit muhūrta, and can I use it when no other muhūrta is available?

it is the roughly 48-minute window around local midday, widely treated as auspicious for most work when no special muhūrta can be found.

Daytime is traditionally divided into fifteen muhūrtas. The eighth, centred on local noon (when the Sun is highest), is called Abhijit — “the victorious”. Its length is one-fifteenth of the day, so about 48 minutes on an equal day and a little longer in summer. Tradition links it with Viṣṇu's victory and holds that it can remove many minor faults of a day.

That is why many priests use Abhijit when an urgent task can't wait for a full muhūrta — a journey, a purchase, a small opening, signing papers. Some traditions avoid it on Wednesdays, and it is generally not used alone for major saṁskāras like a wedding.

Note that local noon is rarely exactly 12:00 by the clock; it depends on your longitude and time zone, so check the time for your city.

Source: Muhūrta Cintāmaṇi; modern practice · 8th of 15 day-muhūrtas

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