All muhurats
Guru Pushya is the Pushya nakshatra falling on a Thursday — Guru's own day. Pushya returns about every 27 days and Thursday every 7, so the two coincide only a handful of times a year, and that scarcity is what makes it sought after for purchases, for gold and for starting something new. The window lasts as long as Pushya is still running on that Thursday, so it usually ends before the day does, and can open the evening before.
Auspicious window
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18Feb21:04 → 19 Feb 06:58Thursday
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18Mar06:34 → 19 Mar 03:20Thursday
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15Apr06:07 → 09:32Thursday
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19Nov01:50 → 06:44Friday
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16Dec09:12 → 17 Dec 07:02Thursday
All times are IST, computed for Ujjain. A tithi or nakshatra turns at the same instant everywhere, so your timezone changes only the clock it reads — but a window bounded by the weekday also follows your own sunrise. The app computes both for your city.