Surya Siddhanta
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यद् ग्राह्यम् अधिके तस्मिन् सकलम् न्यूनम् अन्यथा । योगार्धाद् अधिके न स्याद् विक्षेपे ग्राससम्भवः॥
If this quantity should be greater than the diameter of the disc which is to be eclipsed, the eclipse will be a total one, otherwise it will be partial. But if the Moon's latitude be greater than half the sum (mentioned in the preceding Śloka) there cannot be an eclipse.
english translation
yad grAhyam adhike tasmin sakalam nyUnam anyathA । yogArdhAd adhike na syAd vikSepe grAsasambhavaH॥
hk transliteration by Sanscriptग्राह्यग्राहकसम्योगवियोगौ दलितौ पृथक् । विक्षेपवर्गहीनाभ्याम् तद्वर्गाभ्याम् उभे पदे॥
Find the halves separately of the sum and difference of the diameter of that which is to be covered and that which is the coverer. Subtract the square of the (Moon's) latitude (as found at the time of the syzygy) severally from the squares of the half sum and the half difference and take the square-roots of the results.
english translation
grAhyagrAhakasamyogaviyogau dalitau pRthak । vikSepavargahInAbhyAm tadvargAbhyAm ubhe pade॥
hk transliteration by Sanscriptषष्ठ्या सम्गुण्य सूर्येन्द्वोर् भुक्त्यन्तरविभाजिते । स्याताम् स्थितिविमर्दार्धे नाडिकादिफले तयोः॥
These roots multiplied by 60 and divided by the diurnal motion of the Moon from the Sun give the Sthityardha the half duration of the Eclipse and mardárdha the half duration of the total darkness in ghaṭikás (respectively).
english translation
SaSThyA samguNya sUryendvor bhuktyantaravibhAjite । syAtAm sthitivimardArdhe nADikAdiphale tayoH॥
hk transliteration by Sanscriptस्थित्यर्धनाडिकाभ्यस्ता गतयः षष्ठिभाजिताः। लिप्तादि प्रग्रहे शोध्यम् मोक्षे देयम् पुनः पुनः॥
The diurnal motions (of the Sun, the Moon and her ascending node) multiplied by the Sthityardha (above found) in ghaṭikás and divided by 60 give their changes in minutes. Then to find the first exact Sthityardha, subtract the changes of the Sun and the Moon from their places and add the node's change to its place; from these applied places find the Moon's latitude and the Sthityardha. This Sthityardha will be somewhat nearer the exact one, from this find the changes and apply the same mode of calculation (as mentioned before) and repeat the process until you get the same Sthityardha in every repetition.
english translation
sthityardhanADikAbhyastA gatayaH SaSThibhAjitAH। liptAdi pragrahe zodhyam mokSe deyam punaH punaH॥
hk transliteration by Sanscriptतद्विक्षेपैः स्थितिदलम् विमर्दार्धे तथा +असकृत् । सम्साध्यम् अन्यथा पाते तल्लिप्तादिफलम् स्वकम्॥
This Sthityardha will be the exact first Sthityardha. But to find the latter Sthityardha add the changes of the Sun and Moon to their places and subtract the node's change from its place; from these applied places find the Moon's latitude aud the Sthityardha again and repeat the same process until the exact latter Sthityardha be found. In the same manner determine the first and second exact mardárdhas by repeated calculations.
english translation
tadvikSepaiH sthitidalam vimardArdhe tathA +asakRt । samsAdhyam anyathA pAte talliptAdiphalam svakam॥
hk transliteration by Sanscript