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

397
Fig. 88
Comm. Let M₁, M₂, M₃ be the positions of the centre
of the Moon's disc at the moment of first contact, at the
middle of the eclipse and the moment of last contact
respectively. Draw a circle with radius M₁ R₁ = r+p
which is called the Manaikyārdha Vritta. Let M₁ E₁
represent the Eastern direction known as the Sama-
mandalaprāchī. Draw E₁ V₁ equal to Hsine of the Valana,
so that M₁ V₁ is the Krānti-Vritta-prāchī ie. the point
of intersection of the Ecliptic with the Eastern horizon.
Draw N₁ R₁ perpendicular to M₁ V₁ in the form of Hsine,
which is the latitude (Vikṣepa) of the Moon at the moment
of first contact. With R₁ as centre draw the Grāhaka-
Vritta with p as centre ; this circle represents the Rāhu-
Bimba.
Similarly let M₃ be the centre of the Moon's disc at
the moment of last contact. Draw a circle with M₃ as
centre and r+p as the radius which is the Manaikyārdha-
Vritta. Let M₃ W₃ be the direction to the West, the
Samamandalapratichī. From W₃ draw W₃ V₃ the Hsine
of the Valana, so that M₃ V₃ is now the Krāntimandala-
pratīchī ie. the point of intersection of ecliptic with the
western horizon. Let, the Vikṣepa N₃ R₃ be drawn as a
Hsine of the Mānaikyārdha Vritta. With R₃ as centre
and radius p, draw the Rāhu-Bimba.
Let M₂ be the centre of the Moon's disc at the middle
of the eclipse. Let M₂ S₂ represent the South with respect
to the prime-vertical. From S₂, draw the Hsine of the
Valana S₂ V₂ so that M₂ V₂ is the Krānti-Vritta-Dakshiṇā
ie. the South with respect to the Ecliptic. Now the