Surya Siddhanta

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मध्येन्दुव्यासगुणितम् मध्यार्कव्यासभाजितम् । विशोध्य लब्धम् सूच्याम् तु तमो लिप्तास् तु पूर्ववत् ॥

- by the mean diameter of the Moon (or 480) and divide the product by that of the Sun (or 6,500); subtract the quotient from the Súchí the remainder will be the diameter (in yojanas) of the Earth's shadow (at the moon); reduce it to minutes as mentioned before (i. e. by dividing it by 15).

english translation

madhyenduvyAsaguNitam madhyArkavyAsabhAjitam । vizodhya labdham sUcyAm tu tamo liptAs tu pUrvavat ॥

hk transliteration by Sanscript

Chapter 4

Verse 6