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The circumference of the parallel of latitude at 60°N is approximately…
  • A
    18706 NM.
  • B
    10800 NM.
  • C
    20000 NM.
  • D
    34641 NM.

DEPARTURE

Departure is the distance between two meridians along a specified parallel of latitude.
Departure (NM) = Change in longitude (in minutes) × cos lat

  • The change of longitude is given in degrees.Therefore, we must multiply by 60 to convert it into minutes.
Circumference = 360º
Circumference = 360º x 60 x cos 60º
Circumference = 10 800 NM

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