Shiva Purana
ऋतोर्विकारभूताश्च गुणास्तत्रैव भामिनि ॥ प्रमाणं दक्षिणं प्रोक्तं ज्ञातव्यं प्राणवेदिभिः ॥ ४३ ॥
O fair lady, the attributes and the aberrations of the seasons constitute that in the right-hand practices. This shall be known by those who understand the motion of vital airs.
english translation
RtorvikArabhUtAzca guNAstatraiva bhAmini ॥ pramANaM dakSiNaM proktaM jJAtavyaM prANavedibhiH ॥ 43 ॥
hk transliteration by Sanscript