Gen 1:5 | JFB | STEP | 5. first day-- a natural day, as the mention of its two parts clearly determines; and Moses reckons, according to Oriental usage, from sunset to sunset, saying not day and night as we do, but evening and morning.

‏ Genesis 1:5

5. first day--a natural day, as the mention of its two parts clearly determines; and Moses reckons, according to Oriental usage, from sunset to sunset, saying not day and night as we do, but evening and morning.