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EPIGRAPHIA INDICA.
(VOL. XII.
3rd step-From Saturn's Apsis: 596° 27'; subtract
Satarn twice corrected : 301° 31' ; result corrected Anomaly : 294° 56'; corresponding equation from Anomalistic Table-6° 57'; add whole of it to mean Saturn : 802° 8'-6° 57'=295° 11';
Result : Saturn thrice corrected. 4th step-From mean Sun: 376° 23'; subtract
Saturn thrice corrected : 295° 11'; result corrected Commutation : 81° 12'; corresponding equation from Commutation Table +6° 9'; add whole of it to Saturn thrice corrected 295° 11' +6° 9= 301° 20'. Result : true Saturn (Kumbha 1° 20').
Hints for Calculation. 1. If the year in which a given constellation occurred is known, but the exact date is not stated the best way to proceed for finding approximately the date of the given constellation is the following. The sign in which the Sun stands directly gives the solar month, e.g. Sun in Mesha indicates solar Vaisakba. First caloolate new moon in the solar month thus found. My general Tables furnish the solar date of new moon; e.g. in 1168 A.D. it occurred on the 16th solar Vaišākha. The place of the moon at new moon is the same as that of the Sun in the sign assigned to the latter, and approximately the degree which both luminaries are stationed at has the same number as the solar date; in our example Měsha 16o. Now it is easy to find approximately the place in which the moon is after a given number of days. For the moon by her mean motion travels 13o 10 each day. For easier calculation I have drawn up the following small table which shows the motion of the moon in 28 successive days or the period of her sidereal revolution.
days.
In our last example new moon occurred on the 16th solar Vaisakhs; when did the moon enter Vrisha and how long did she remain in that sign ? As Vrisha covers the part of the Ecliptio from 30° to 60, it will be seen that she entered Vrisha on the next day. For new moon occurred in Mösha 16° and there are 14° of Mösha left;' she will be in Vrisha for two days more. To give another example, let us suppose that the sun stood in Mithuna, the moon in Dhanus, and now moon occurred on the 20th solar Ashädha; the problem is how many days before or after the 20th Ashidha occurred the above constellation of Sun and Moon. New moon on 20th Ashadha is in space : Mithuna 200, or 80° Longitude ; Dhanus is from 240° to 270° Longitude. To
. For convenience of calculation we shume solar months of 80 days each ; in a first approximation the diffonce between mean and true solar time may be neglected.
