What determines
the length of
a day on Earth?
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The rotation of
the Earth on its axis.
The Earth rotates
once every
24 hours.
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Was Earth’s day
always 24 hours?
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NO!
When the Earth and
Moon system first formed,
the Moon was much closer
and the days were shorter.
Perhaps as short as 4 hours!
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Are the number
of hours of daylight
always the same
throughout the year?
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NO!
Daylight hours vary
throughout the year.
The day with
the most hours of
daylight occurs at
the beginning of summer.
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Which planet
has the shortest day?
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Answer
Jupiter!
It is the fastest spinning
planet in our Solar System.
It makes one complete rotation
every 10 hours.
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