Page:Sewell Dikshit The Indian Calendar (1896) proc.djvu/121

170. Rule 1. Take down (${\displaystyle w}$) the week-day number of the initial day of the corresponding Muhammadan year, or the year previous if the given date falls before its initial date, from Table XVI., col. 2, and (${\displaystyle d}$) the corresponding date-indicator in brackets as given in col. 3. Subtract (${\displaystyle d}$) from the collective duration up to the given A.D. date, as given in Table IX., Parts i. or ii. as the case may be. Add the remainder to (${\displaystyle w}$). From the same remainder subtract the collective duration given in the Table in Art. 163 above which is next lowest, and add 1. Of these two totals (${\displaystyle w}$) gives, by casting out sevens, the day of the week, and (${\displaystyle d}$) the date of the Muhammadan month following that whose collective duration was taken.

Rule 2. When the given English date is in a leap-year, and falls on or after February 29th, or when its date-number is more than 365 (taken from the right-hand side of Table IX.), and the year preceding it was a leap-year, add i to the collective duration given in Table IX.

Rule 3. For Old and New Style see above. Art. 167.

Example. Required the Muhammadan equivalent of January 16th, 894 A.D.

Since by Table XVI. we see that A.H. 1312 began July 5th, 1894 A.D., it is clear that we must take the figures of the previous year. This gives us the following:

Answer.—Tuesday, Rajab 9th, A.H. 1311.

By the kindness of Dr. J. Burgess we are able to publish the following perpetual Muham- madan Calendar, which is very simple and may be found of use. Where the week-day is known this Calendar gives a choice of four or five days in the month. But where it is not known it must be found, and in that case our own process will be the simpler, besides fixing the day exactly instead of merely giving a choice of several days.