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bahiḥ akalpitā vṛttiḥ mahā-videhā tataḥ prakāśa-āvaraṇa-kṣayaḥ

External non-imaginary fluctuation is the great discarnate, hence the covering of the light diminishes

bahis - external

akalpitā - non-imaginary

vṛtti - fluctuation; modification; turning; set in motion, course of action, behaviour, movement; activity, function; profession

mahā - great

videha - discarnate

tatas - hence, from that

prakāśa - brightness

āvaraṇa - covering

kṣaya - diminish, wasting or wearing away