Saurapurana 26.28

26.28

sūrye tapati yo vahniḥ śuciragniriheṣyate
babhūvuḥ saṃtatau teṣāṃ catvāriṃśacca pañca ca

The fire that burns in the sun is regarded here as the Śuci fire. / In their lineage there were forty-five [fires];