Mar ngo sngon 'gro

(mar ngo sngon 'gro) the original Kālacakra Mūlatantra used the waning-first (mar ngo sngon 'gro) in which a month starts with the waning fortnight immediately following full Moon, and is followed by the waxing fortnight, ending with the next full Moon. It is said that this was the original Kālacakra system, but this was changed when the shorter Laghu Tantra was composed in order to help enable Hindu followers to accept the Kālacakra methods.