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

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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.