zla ba'i thun min longs spyod

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ཟླ་བའི་ཐུན་མིན་ལོངས་སྤྱོད
rgyu skar chu tshod 1620 mkha' mes divided te 54 : nyi ma dang thun mong ma yin pa'i rtag longs yin la, by adding the sun's lunar day coursing tshes longs zla ba'i tshes longs is established [IW]