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What is the difference in time when the sun moves 10° of longitude?

  • A

    0:30 h

  • B

    0:04 h

  • C

    0:40 h

  • D

    1:00 h

At the Equator arc, and therefore longitude, can be directly related to distance. Arc, and therefore longitude, can also be related to time. As the mean Sun appears to travel 360° in 24 hours, we can get the following Arc-to-Time conversions:

  • 360° = 24 hours
  • 15° = 1 hour
  • 1° = 4 minutes
  • 1' = 4 seconds

For this question, the Arc-to-Time conversion is based on the Change of Longitude 10°.

So, since 1° = 4 minutes, then 10° of longitude are equal to: 10° x 4 minutes = 40 minutes or 00:40.

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