panchang
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Nalla Neram vs Abhijit muhurat: two ways of finding a good hour
Nalla Neram uses the Gowri Panchangam's eighths of the day; Abhijit is the 8th of 15 daytime muhurtas around noon. How each is computed and when they agree.
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How Rahu Kaal is calculated, and why it differs by city
Rahu Kaal is one-eighth of the time between local sunrise and sunset, chosen by weekday. The method, a worked example, and why fixed charts are wrong.
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Horai timings explained: planetary hours, and the two ways to count them
How hora and horai timings are calculated from sunrise, the planetary sequence, traditional uses of each hora, and why some almanacs use fixed 60-minute hours.
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Gowri Panchangam explained: the weekday table and how to use it
The full Gowri Panchangam weekday table, what each of the eight periods means, how to compute the times from local sunrise, and how it gives Nalla Neram.
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Choghadiya explained: day and night tables, meanings and how to read them
How choghadiya splits day and night into eight periods, what Amrit, Shubh, Labh, Char, Rog, Kaal and Udveg mean, and how to read the table for your city.