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The Bhutanese calendar –
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The Bhutanese calendar –
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On this page are available both an archive of calendars from the Bhutanese tradition together with open source software for creating the calendar (scroll down to access the list of archived calendars). Bhutan calendars are very similar to those in the Phugpa tradition, but with certain values used in the calculations being different. The most obvious difference with the Phugpa and all other calendars is that the weekdays are one ahead of all others. So, if today is a Wednesday in the Phugpa, Tsurphu, and Gregorian calendars, in Bhutan it is a Thursday. Also, in the Bhutan tradition, an intercalary month takes the name and qualities of the month preceding it rather than the one following it. The main text for the definitions of the Bhutanese calendar is the "rtsis gzhung gdan dus thun mong gi nges pa gsar du bkod pa dang bcas pa'i lag len lhan thabs gsal ba'i sgron me", by "lha dbang blo gros". In that text the epoch given is 1754, and so in the following, Bhutanese calendars were originally listed from 1755 onwards (up to 2049). However, I have been asked to extend the listing, and now the years 1600-2099 are covered. It should be understood that years before 1754 may not be relevant in historical references. Please scroll down and click on the year for which a calendar is required. The basic epoch data used to produce these calendars, from the text by "lha dbang blo gros", are given on this page. Note that he uses a slightly different mixed-radix system from the Phugpa tradition, but his mean motions of the Sun and Moon are in fact identical. To access the software and source code used to create these calendars, click here:
If you find any errors in this software, or have any comments, suggested changes or additions, please address these to Edward Henning. To access individual calendars, click on the relevant year below:
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