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

476 and gradually set there (to rise again in the west) as before. Comm. Explained above. Verse 6. Kālāmśas or distance in degrees from the Sun within which the planets rise or set heliacally. The Kālāmśas with respect to the Moon, Mars, Mer- cury, Jupiter, Venus and Saturn, or the degrees of distance from the Sun within which they rise or set heliacally are 12, 17, 14, 11, 10, 15 respectively. In the case of Mercury and Venus when they are retrograde the Kālāmśas are 12, and 8 respectively. Comm. The Kālāmśas given above depend upon the luminosity of the respective planets. When Mercury and Venus happen to be retrograde, the Kālāmśas happen to be 2° less in each case because they are then nearest to the earth and as such being most luminous as seen by us will not set heliacally till they are very near the Sun. Verse 7. To compute the moment when a planet rises or sets heliacally. If it is to be known when a planet rises or sets helia- cally the position of the Prāk-Dṛk-graha or the Paschima- Dṛk-graha as the case may be (Prāk-Dṛk-graha in case the rising or setting takes place in the east or the other in the other case) and that of the Sun also are to be computed on a day a little before the day of rising or setting as prognosticated by the Śīghra anomaly. In case the planet rises or sets in the west, to obtain the lagna the position of the Sun is to be increased by 180°. Comm. Clear.