Planets, stars and constellations and the length of the duration of the four Yugas and it further more contains Rik, Saman, Yajur Vedas, the Adhyatma.
ग्रहनक्षत्रताराणां प्रमाणं च युगैः सह। ऋचो यजूंषि सामानि वेदाध्यात्म तथैव च॥