Sefaria, 'Targum Jonathan on Genesis'
And the LORD called the light Day, and made it that the inhabitants of the world might labour in it; and the darkness he called Night, and made it that in it the creatures might have rest. And it was evening, and it was morning, one day.
Fresh draft (Claude), approved by Wilson Pruitt · cc-by
Sefaria, 'Targum Jonathan on Genesis' · pd
Two things at once. The targum keeps the cardinal, yoma chad, as Onkelos does. And it supplies a reason for the pair that no Hebrew word demands: day is for labour, night for rest. Etheridge's 1862 English prints 'the First Day' — a translator taking the side of the ordinal, exactly as the WEB does — so the cardinal is restored here in a fresh draft. Corrected at Phase 6: this was written as though the ordinal were Etheridge's response to the expansive targum. It is not. His Onkelos, fetched from archive.org because Sefaria's Etheridge has no Genesis 1, prints 'Day the First' for the same Aramaic yoma chad, and 'the Second Day' after it — so the ordinal is a habit of the translator applied evenly, not a judgement about this text.