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Question

Fill in the blank:

$1$ mean solar day = _____ $s$ .
$43200$
$86636$
$21600$
$10800$

A

86636

B

21600

C

10800

D

43200

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Solution

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A solar day is the time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky, which is equal to $24 h r 03 m i n 55 s$ , i.e. in total, $86636 s e c o n d s$ .

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