Day Starts at Sundown and Ends at Sunset
The Hebrew translation of Genesis 1:5 "And God called the light Day, and the darkness He called Night. And there was evening and there was morning, one day." The Hebrew translation of Genesis 1:8 "And God called the firmament Heaven. And there was evening and there was morning, a second day." There are two references here showing that the definition of the day is evening and then morning. The question could be asked does "morning" mean 6am until noon according to the tradition of the modern world? The correct interpretation is to see that day is light.
Notice also in Genesis 1:13 that evening and morning is described as the third day also.
Where did light come from prior to the creation of the Sun, Moon and Stars?
In Genesis 1:3 "And God said: 'Let there be light.' And there was light." What is the source of this light? The light had to be coming from God.
The Fourth Day
On the fourth day:
(a) in Genesis 1:14-15, the Stars are created, "And
God said: 'Let there be lights in the firmament of the heaven to divide the day
from the night; and let them be for signs, and for seasons, and for days and
years; and let them be for lights in the firmament of the heaven to give light
upon the earth.' And it was so.".
(b) in Genesis 1:16-18, the Sun and the Moon are created, "And God made the two great lights: the greater light to rule the day, and the lesser light to rule the night; and the stars. And God set them in the firmament of the heaven to give light upon the earth,".
(c) in Genesis 1:19, God's Light is no longer required.
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