पञ्चसिद्धान्तिका (आचार्य वराहमिहिर - सूर्य, रोमक, पौलिश, वासिष्ठ एवं पितामह सिद्धान्त)

Chapter Two
VĀSIṢṬHA-SIDDHĀNTA — PLANETARY COMPUTATIONS ETC.
२. द्वितीयोऽध्यायः
वासिष्ठसिद्धान्तः — ग्रहादिगणितम्
Introductory
Now follow the five Siddhāntas. Of these the Vāsiṣṭha is given first, as being the most primitive
among the Siddhāntas that distinguish between true and mean motions, unlike the Paitāmaha which
gives only the mean motion. For a detailed exposition of some of the verses see T.S.K. Sastry, 'The
Vāsiṣṭha Sun and Moon', JOR 25 (1955-56) 19-41 and K.S. Shukla, 'The PS of VM(2)', Gaṇita
28 (1977) 99-116.
[स्फुटरविः]
'कृत'-'गुणमृतु'-युत'मेकर्तुमनु'हतं 'षड्यमेन्दु'भिर्विभजेत् ।
'शशि-ख-ख-ख-यम-कृत-स्वर-नव-नव-वसु-षट्क-विषयो'नैः ॥ १ ॥
True Sun

1. Multiply the Days from Epoch by 4 and add 6. Divide this by 1461 (and
   take the remainder). Take from this, successively, the quantity 126, reduced
   by 1, 0, 0, 0, 2, 4, 7, 9, 9, 8, 6, 5 (i.e., the twelve quantities 125, 126, 126, 126,
   124, 122, 119, 117, 117, 118, 120, 121). (The Sun's rāśis, Meṣa etc. are succes-
   sively got.)
   The direction is: Multiply the days by 4, add 6, divide by 1461 and take the remainder. From this
   first take off 125, and consider that Meṣa is gone. Then from what remains deduct 126 and consider
   Ṛṣabha is gone, and so on. The Sun is in the rāśi corresponding to the number which cannot be
   deducted on account of its being less than what is left over. Multiply what is left over by 30 and
   divide by what cannot be deducted. The position of the Sun in that rāśi is got, in degrees.
   It is to be noted that even 'Days from Epoch' is not mentioned here but we take it as understood
   because every work of this sort requires it. It is not specifically mentioned that this rule is for com-
   puting the true Sun but we can infer it from the quantities here given and the work asked to be
   done. Even the work is not clearly and completely given. But knowing what the author is about, we
   can see what is wanted to be done. TS have refrained from interpreting this, as an impossible task.
   1a. A1. कृतगुणषषमृतु; A2. कृतगुणपयमृतु;
   BC. कृतगुणषड्ऋतु b. D. वियुजेत्
   a-b. A3. मैकर्तु c-d. A.B.C. खरकृत for कृतस्वर