Shatapatha Brahmana 11.1.3.3

11.1.3.3

atha yadāmāvāsyeneṣṭvā adityai carumanunirvapatyeṣa vai somo rājā devānāmannaṃ yaccandramāḥ sa yatraiṣa etāṃ rātriṃ na purastānna paścāddadṛśe tenaitadanaddheva havirbhavati tenāpratiṣṭhitamiyaṃ vai pṛthivyaditiḥ seyamaddhā seyam pratiṣṭhitaiteno hāsyaitadaddheva havirbhavatyetena pratiṣṭhitametannu tadyasmādanunirvapatyatha yasmānnānunirvapet

And as to why, after performing the New-moon sacrifice, he prepares a pap for Aditi,--that moon doubtless is the same as King Soma, the food of the gods: when on that night he is not seen either in the east or in the west, the oblation becomes, as it were, uncertain and unfirm. Now Aditi is this earth, and she, indeed, is certain and firmly established: thereby, then, that oblation of his becomes certain and firmly established. Such, then, is the reason why he prepares additional oblations; now as to why he should not prepare them.