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In Indian astronomy, the prime meridian is the great circle of the Earth passing through the north and south poles, Ujjayinī and Laṅkā, where Laṅkā was assumed to be on the Earth's equator.

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Translates to: for a triangle, the result of a perpendicular with the half-side is the area.

When it is sunrise at Lanka, it is sunset at Siddhapura, midday at Yavakoti, and midnight at Romaka.

When sixty times sixty years and three quarter yugas (of the current yuga) had elapsed, twenty three years had then passed since my birth.

100 plus 4, multiplied by 8, and added to 62,000: this is the nearly approximate measure of the circumference of a circle whose diameter is 20,000.

The apparent motion of the Sun along the ecliptic (red) - With Kala-kriya he turned to astronomy — in particular, treating planetary motion along the ecliptic.

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