A star is seen to be rising on the eastern horizon at $23 : 00$ hrs. At what time the star will rise 2 days later

00 : 00

hrs

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21 : 40

hrs

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23 : 20

hrs

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23 : 00

hrs

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Solution

The correct option is D $23 : 00$ hrs
As a Star very far from us appears moving due to the earth's rotation about its axis. Its period to rise is exactly equal to the time required for one complete rotation of the earth. Because each takes exactly $24$ hours to complete one rotation. So after days $(2 \times 24 h r s)$ . So star will be seen rising at the same time
$(i . e ., 23 : 00 h r s)$

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A star is seen to be rising on the eastern horizon at 23:00 hrs. At what time the star will rise 2 days later

A star is seen to be rising on the eastern horizon at $23 : 00$ hrs. At what time the star will rise 2 days later