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Relating Earth's rotation and revolution to day and night.
We
start with our reference longitude (arrow) pointed directly at Sun,
that
is noon local time. 30 complete rotations later (about a month)
the
reference longitude is again pointing exactly the same direction as at
the start. Because Earth has revolved about 30 degrees in its
orbit,
pointing the same direction is no longer pointing at Sun. The
local
time is 10 am, not noon.