snga phyi gsum mthong
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སྔ་ཕྱི་གསུམ་མཐོང
astr in calculating tshes chad lhag, by 1 solar day [nyin zhag], tshes zhag ril po gcig and the previous and following days are seen together 'grogs na tshes zhag gcig po = chad &, de las ldog ste when by 1 day three are seen de las ril po dang 'grogs pa'i tshes de are called "lhag par", because they are in addition to the tshes chad day [IW]