Khandakhadyaka: A Practical Manual

Now, take the number 487 the number of revolutions, multiplied by 2, which is 813078; this is the first value to be set aside. From this, subtract the mean position likely referring to the ahargana calculation. After dividing, the result is 0;17;14 in days and so on. From this, subtract 813078; the remainder is 8130742146. When this is divided by the vikhannaga a specific divisor, the avamaratras lost lunar days are 1156, with a remainder of 402142146. Adding four ghatikas units of time, approx. 24 mins to this, we obtain 402156146. This is to be used. These avamaratras lost lunar days, 1156, are to be subtracted from this lunar day count of 73871, resulting in the savana civil day count of 72715, starting from the Sun. Dividing this by 7, the remainder is 6. Thus, counting from the Sun, the sixth is Venus the week-day calculation. Therefore, here, it is Friday, and one should calculate all instances accordingly. Now, since the remainders of the intercalary months and the lost lunar days in the manual are similar to the Aryabhatatantra Treatise of Aryabhata, he states for that purpose:

When the remainders of the intercalary months and the lost lunar days exceed seventeen ghatikas units of time.

One should add seventeen ghatikas to the remainder of the intercalary months. One should add four ghatikas to the remainder of the lost lunar days. Therefore, all of this has been explained. Now, the Moon’s apogee and node, which are obtained by the method to be stated, are greater than those in the Aryabhatatantra. Because they are greater, they are reduced to become equal to the Aryabhatatantra; he states for that purpose:

The Moon's apogee and the Moon's node are [to be reduced] by five and ten minutes respectively. original: "inducchacandrapātāvanī śaradigvaliprābhiḥ" ||6||

Five minutes are to be subtracted from the Moon's apogee obtained by the manual. Ten minutes are to be subtracted from the Moon's node obtained by the manual. When done in this way, they become equal to the Aryabhatatantra. That is the meaning. Now, the Mercury's shighra conjunction anomaly and the planetary positions obtained by the method to be stated are greater than those from the Aryabhatatantra. He states how Mars, Jupiter, and Mercury become equal to the Aryabhatatantra:

Saturn by three, Mercury's shighra by twenty-two, Mars by two, and Jupiter by four are to be increased; these become equal to the ardharatrika midnight system of Aryabhata. ||7||

Three minutes are to be subtracted from the Saturn obtained by the manual. Twenty-two minutes are to be subtracted from the Mercury's shighra obtained by the manual. Two minutes are to be added to the Mars obtained by the manual. Four minutes are to be added to the Jupiter obtained by the manual. That is the meaning. All of these become equal to Aryabhata. These are as they appear in the ardharatrika system. We shall explain the instant-calculation later.