Many places have daylight savings or summer time where they shift the clock an hour.. so afternoon is longer at the expense of evening.
The world is split in 24 time zones, each one being an hour of rotation or 15 degrees wide. This is not accidental.
Early navigation using an accurate clock will show that if a clock is set at noon at the British naval observatory, (prime meridian 0 degrees) if you travel any where on earth, at “Solar noon” the clock will show a “time” that is the “amount” of East/west rotation from the prime meridian.
So at solar noon in Chicago the clock might read around 6:48am ( around 87 degrees west)
In Paris it would read something like 12:05pm (2 deg east)
In Tokyo it would read 9:20pm. (140 degrees east )
( my math might not be exact)
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