सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

155 plained by this author in his work ‘A critical study of Ancient Hindu Astronomy’ (published by the Karnatak University) page 98. Verse. Cited from Golādhyāya. The equation of centre is to be applied to the mean planet to obtain the centre of the Śīghraepicycle; then to obtain the true position the Śīghraphala is to applied to the Mandasphutagraha; hence the two equations are mutually related so that the true position is obtained after repeated application of the two equations. Comm. Explained above. Verse 36 latter half and 37. The true daily motion of the planet is the excess of the longitude of the true planet of the next day over that of the true planet of the previous day. The Kotiphala being multiplied by the daily motion of the Manda mean anomaly and divided by the radius, and the result being added to or subtracted from the mean motion, gives what is called Mandasphutagati. Comm. Already explained before. If M₁, M₂ and S be the mean planet, Mandasphutagraha, and the true planet respectively, and if E₁ and E₂ be respectively the two equa- tions, then M₁ + E₁ = M₂, M₂ + E₂ = S so that δM₁ + δE₁ = δM₂ and δM₂ + SE₂ = δS Here δM₁ = mean daily motion, δE₁ = daily variation in the Mandaphala, δM₂ = daily motion of the Mandasphuta graha or what is the same Mandasphutagati, δE₂ = daily variation in the second equation and δS = True daily motion.