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न छेद्यकम् ऋते यस्माद् भेदा ग्रहणयोः स्फुटाः । ज्ञायन्ते तत् प्रवक्ष्यामि छेद्यकज्ञानम् उत्तमम्॥
Since the phases of the lunar and solar Eclipses cannot be exactly understood without their projection, I therefore explain the excellent knowledge of the projection.
english translation
सुसाधितायाम् अवनौ बिन्दुम् कृत्वा ततो लिखेत् । सप्तवर्गाङ्गुलेनादौ मण्डलम् वलनाश्रितम्॥
Having marked at first a point on the floor levelled with water, describe, on the point as centre with 49 digits as radius, a circle in which the valaná (as found in the fourth Chapter) i is to be marked.
english translation
ग्राह्यग्राहकयोगार्धसम्मितेन द्वितीयकम्। मण्डलम् तत् समासाख्यम् ग्राह्यार्धेन तृतीयकम्॥
(On the same centre,) describe a second circle named the samása with the radius equal to half the sum of the diameters of that which is to be covered and that which is the coveror, and a third circle with the radius equal to the semi-diameter of that which is to be covered.
english translation
याम्योत्तराप्राच्यपरासाधनम् पूर्ववद् दिशाम् । प्राग् इन्दोर् ग्रहणम् पश्चान् मोक्षो +अर्कस्य विपर्ययात् ॥
(In these circles determine the north and south, and the east and west lines[1] as mentioned before (in the 3rd Chapter). In a lunar eclipse, the obscuration first begins to the east and it ends to the west, (but) in a solar one the reverse of this takes place. (Therefore in the projection of the lunar eclipse, the valaná is to be marked as sine to the eastern or western side of the outer circle above described according as it is found at the beginning or end of the eclipse, but in the projection of the solar eclipse, the valaná found at the beginning or the end of the eclipse is to be marked to the western or eastern side of the circle respectively.) [1. It is evident that these lines will represent the circle of position, and the secondary to it passes through the body which is to be eclipsed. B. D.]
english translation
यथादिशम् प्राग्रहणम् वलनम् हिमदीधितेः। मौक्षिकम् तु विपर्यस्तम् विपरीतम् इदम् रवेः॥
In a lunar eclipse, the deflection (valana) for the contact is to be laid off in its own proper direction, but that for the separation in reverse; in an eclipse of the sun, the contrary is the case.
english translation