Skandapurana 16.11.62

16.11.62

tayostu rājñī dyaurjñeyā nikṣubhā pṛthivī smṛtā ..
saumyamāsasya saptamyāṃ dyauḥ sūryeṇa ca yujyate .. 62 ..

Of the two, the sky is known as Rājñī, and the earth is remembered as Nikṣubhā. / On the seventh day of the bright half of the month, the sky is united with the sun.