Surya Siddhanta
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भानोर् भार्धे महीच्छाया तत्तुल्ये +अर्कसमे +अपि। शशाङ्कपाते ग्रहणम् कियद्भागाधिकोनके ॥
The Earth's shadow (always) remains at the distance of 6 signs from the Sun. When the place of the Moon's ascending node equals the place of the shadow or that of the Sun, there will be an eclipse (lunar or solar). Or when that node is beyond or within the place of the shadow or that of the Sun, by some degrees, the same thing will take place.
english translation
bhAnor bhArdhe mahIcchAyA tattulye +arkasame +api। zazAGkapAte grahaNam kiyadbhAgAdhikonake ॥
hk transliteration by Sanscriptतुल्यौ राश्यादिभिः स्याताम् अमावास्यान्तकालिकौ । सूर्येन्दू पौर्णमास्यन्ते भार्धे भागादिकौ समौ॥
The places of the Sun and the Moon found at the time of the new moon are equal (to each other) in signs, (degrees) &c. and at the instant of the full moon they are at the distance of 6 signs from each other.
english translation
tulyau rAzyAdibhiH syAtAm amAvAsyAntakAlikau । sUryendU paurNamAsyante bhArdhe bhAgAdikau samau॥
hk transliteration by Sanscriptगतैष्यपर्वनाडीनाम् स्वफलेनोनसम्युतौ । समलिप्तौ भवेताम् तौ पातस् तात्कालिको +अन्यथा॥
(Find the changes of the places of Sun, the Moon and her ascending node in the instant from midnight to the instant of the syzygy as mentioned in śloka 67th of 1st Chapter). To the places of the Sun and the Moon (as found at the midnight) apply by subtraction or addition their changes according as the instant of the syzygy is before or after midnight: the results are called the sama-kala places of the Sun and the Moon: But increase the place of the node (at midnight) by its change, if the instant of the syzygy be before midnight, or diminish it if it be after midnight.
english translation
gataiSyaparvanADInAm svaphalenonasamyutau । samaliptau bhavetAm tau pAtas tAtkAliko +anyathA॥
hk transliteration by Sanscriptछादको भास्करस्येन्दुर् अधःस्थो घनवद् भवेत् । भूच्छायाम् प्राङ्मुखश् चन्द्रो विशत्य् अस्य भवेद् असौ॥
The Moon being like a cloud in a lower sphere covers the Sun (in a solar eclipse); but in a lunar one the Moon moving eastward enters the Earth's shadow and (therefore) the shadow obscures her disc.
english translation
chAdako bhAskarasyendur adhaHstho ghanavad bhavet । bhUcchAyAm prAGmukhaz candro vizaty asya bhaved asau॥
hk transliteration by Sanscriptतात्कालिकेन्दुविक्षेपम् छाद्यच्छादकमानयोः। योगार्धात् प्रोज्झ्य यच्छेषम् तावच् छन्नम् तद् उच्यते॥
Take the Moon's latitude (at syzygy) from half the sum of the diameter of that which is to be covered and that of the coverer (in a lunar or solar eclipse); the remainder is the greatest quantity of the eclipsed part of the disc.
english translation
tAtkAlikenduvikSepam chAdyacchAdakamAnayoH। yogArdhAt projjhya yaccheSam tAvac channam tad ucyate॥
hk transliteration by Sanscript