number of days expires before the Labyi of Wazo, but it may be inferred that that is what is meant.
82. The rule for reducing adimath thetha to days is to multiply the adimath thetha by 100 and divide by 92. The rule for reducing yet-lun to days is
.
83. A third rule is that every yet-lun pyo year should be a watat year. Yet-lun pyo means that the didi-epact, which has been increasing every year by about 11, amounts to 30 or more, when 30 is deducted from it, one lunar month is added, and the total lunar months exceed those reckoned to the end of the previous year by 13 instead of 12.
84. A fourth rule is that the Labyi on the day following which Lent begins must fall on a day when the moon is within the nekkat Athanli, that is, between longitude 266° 40′ and 270°. Athanli is a Pāli name for the month of Wazo. It is not one of the 27 lunar nekkats.
85. None of these rules seems to have been consistently followed since 1215 B. E. The third is contradictory to the fourth, for when the yet-lun exceeds 19 the full moon of the third succeeding month never reaches Athanli. This point is further discussed in para. 112. The actual practice since 1215 has been that watat has always occurred either in yet-lun pyo year, or in the year preceding yet-lun pyo when the yet-lun amounted to 27, 28 or 29. It is to be observed that under this practice although the rule of Athanli is fulfilled in watat years, yet there are many common years in which the moon's longitude on the Labyi of Wazo falls short of Athanli, namely every year in which the yet-lun is 20, 21, 22, 23, 24, 25 or 26.
86. For determining the places of intercalary days there are three rules given in Thandeikta. One is that every year in which the kaya increases by 5 (not 6) or in other words every awaman pyo year, should have an intercalary day. As thus stated the rule is impossible, for awaman pyo years are frequently not watat years, and yet-ngin never occur except in watat years. If the awaman of watat years alone be considered, the rule is practically the Makaranta rule stated in paragraph 76, and this has certainly not been followed in Burma proper since 1100 B. E.
87. Another rule is based on the average time which should elapse between one yet-ngin and the next. Taking the figures for a quarter Maha Yug in paragraph 34, the total days in 13,358,334 Burmese months, if there were no intercalary days, would be , or 394,270,020 days.
