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

at the foot of the Moon's celestial latitude, the latter has
to be drawn in the opposite direction, since in the pari-
lekha, the centre of the Moon's disc is to be at the centre.
Verses 26 to 29. How to depict the eclipse in
drawing.
Draw a circle with radius equal to that of the radius
of the disc of the eclipsed body and also a circle of radius
equal to r+p, the sum of the radii of the eclipsed and
eclipsing bodies; let directions (east etc.) be marked in
the figure. In the outer circle, draw the Valanajya or the
Hsine of the Sphutavala with respect to the East point,
Valanajyā pertaining to the moment of first contact. In
the case of the Moon, the Valanajyā pertaining to the
moment of first contact should be marked from the East
point and that pertaining to the moment of last contact
should be marked from the West point. In the case of
the Sun the reverse is to be done. If the Valana is south,
it should be marked in the clockwise direction, otherwise
anticlockwise.
Having marked the Valanajyā in the form of a Hsine,
draw the line joining the centre to the top of the Valanajyā,
ie. to the point of intersection of the Hsine with the outer
circle. The celestial latitude of the Moon is to be drawn
from this top of the Valanajyā in the form of Hsine again.
If the latitude pertains to the moment of first contact, it
should be drawn from the top of the Valanajyā pertaining
to that moment, and if it pertains to the moment of last
contact, it should be laid off from the top of the Valanajyā
pertaining to the moment of last contact. The celestial
latitude pertaining to the middle of the eclipse should be
drawn from the centre along the line of Valanasūtra or
the line joining the centre to the top of the Valanajyā.
Taking the extremities of these latitudes, circles are to be
drawn with the radius of the eclipsing body to depict the
eclipse at the respective moments.