Vishuvajyaa aayaa mardha varga vislesha moolamavalambaka:

kranthithrijyaakruthyo rantharapadam dvigunam dinavyaasa

  Square the sine of latitude and deduct from the square of the radius. Its square root is the sine of the co-latitude (its arc being the co-latitude). Square the sine of the declination deduct from the square of the radius and find its root. Twice the result is the day diameter.]]>