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

the Sun. Let A be the position of an observer on the surface of the Earth, elevated by the radius EA from E. Let M and S be in the same line of sight as seen from E. But as seen from A, AS and AM are respectively the lines of sight to the Sun and the Moon. Evidently these lines of sight differ the Moon being depressed more than the Sun. If a line AS' be drawn which is parallel to the central line of sight namely EMS, we find that the Sun is depressed by the angle S'AS whereas the Moon is depressed by the angle S'AM'. These angles differ because the orbits of the Sun and Moon differ. Here the angle S'AS will be very very small, its magnitude being in truth just about 8" only. But the angle S'AM' will be sufficiently large since the Moon is very near the Earth compared with the Sun. Taking ES and AS to be almost parallel due to the largeness of the Sun's distance, the angle SÂM will be almost equal to AM̂S so that we could consider that the Moon is depressed from AS the line of sight to the Sun by the angle SÂM' = AM̂E. This angle AME is called the geocentric parallax of the Moon and the angle AŜE that of the Sun M'ÂS = angle of depression of the Moon over and above that of the Sun = M'AS' - M'AS = EM̂A - EŜA = geocentric parallax of the Moon minus geocentric parallax of the Sun. Verse 2. The presence or absence as well as the positiveness and negativeness of the parallax in longitude. Compute the Lagna at the moment of conjunction of the Sun and the Moon. There will be no parallax in longitude when the Sun is situated at the point called Vitribha or the point whose longitude is ≡ L - 90°, L being the longitude of the Lagna ie. the ascendant which is the point of intersection of the Ecliptic with the 52