आदित्यो ब्रह्मेत्यादेशस्तस्योपव्याख्या-नमसदेवेदमग्र आसीत् ।तत्सदासीत्त-त्समभवत्तदाण्डं निरवर्तत तत्संवत्सरस्यमात्रामाशयत तन्निरभिद्यत ते आण्डक-पाले रजतं च सुवर्णं चाभवताम् ॥ १ ॥
In plain words
The sun is Brahman—this is the teaching. Its further explanation is this: In the beginning, this universe was unmanifest indeed. It became existent, it expanded, it turned into a cosmic egg, and it lay dormant for the span of a year. When it burst open, the two halves of the eggshell became silver and gold.
Close to the Sanskrit
The sun is Brahman—this is the teaching. The further explanation of it: this was non-existent indeed in the beginning. That was existent, that evolved, that became an egg, that turned out, that lay for the measure of a year; that burst open, those two egg-shells became silver and gold.