"A day on earth lasts 24 hours — the time it takes to spin once on its axis.
While
half of the world enjoys daylight, the other half is in
darkness.
This cycle of day and night is
just right for us. If days were much longer the sun’s heat would make life
impossible, and longer nights would be far too cold for anything to survive until the sun rose again. Most other planets in the solar system have much longer or shorter days. On
Venus, a “day” lasts for 243 earth days, on Uranus — which is tipped on its side
— a “day” is 17 hours long, and on the giant planet Saturn a “day” only lasts
for 10 hours. We would never be able to get everything done, or get enough
sleep, if earth were like that!" OurWorld
And God called the light Day,
and the darkness he called Night.
Genesis 1:5