Surya Siddhanta

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कृष्णे षड्भयुतम् सूर्यम् विशोध्येन्दोस् तथासितम् । दद्याद् वामम् भुजम् तत्र पश्चिमम् मण्डलम् विधोः॥

In the dark half-month subtract the longitude of the sun increased by six signs from that of the moon, and calculate, in the same manner as before, her dark part. In this case lay off the base in a reverse direction, and the circle of the moon on the west.

english translation