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520 - PPL(H) Exam Question Bank - The term 'civil twilight' is defined as...

Question 520 - Navigation - PPL(H) - Private Pilot License

The period of time before sunrise or after sunset where the midpoint of the sun disk is 12 degrees or less below the true horizon.
The period of time before sunrise or after sunset where the midpoint of the sun disk is 6 degrees or less below the apparent horizon.
The period of time before sunrise or after sunset where the midpoint of the sun disk is 6 degrees or less below the true horizon.
The period of time before sunrise or after sunset where the midpoint of the sun disk is 12 degrees or less below the apparent horizon.

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