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