How do we measure time

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1.
second
2.
minute
3.
hour
4.
month
5.
year
6.
noon
7.
spin
8.
orbit
9.
zone
10.
earth
11.
planet
12.
Sun
13.
Mercury
14.
Venus
15.
Mars
16.
Jupiter
17.
Saturn
18.
Uranus
19.
Neptune
20.
system