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Given:

Position A: 25°15´N, 010°25´W
Position B: 25°15´N, 005°20´E

What is the Earth convergency between both positions?

  • A
    6.72°
  • B
    7.12°
  • C
    3.36°
  • D
    14.25°

Convergency is the angle of inclination between two meridians at given latitude.
Convergency = Change in Longitude × Sine Latitude

Flying from 010°25’W to 005º20’E, we will cross the Greenwich meridian, along the 25º15’N parallel.

Change in longitude = 010°25’ + 005º20’ = 15°45’
Convergency = 15°45’× Sine (25º15’) = 6°43´= 6.72º

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