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Solving Upper Vertex Latitude

A ship following a great circle track crosses the equator at long. 135° 00' E on course 051° T. If she continues along this great circle track, find the latitude and longitude of the upper vertex.

Given:

    Course = 051° T
Longitude = 135° 00'

What is asked?

Latitude and longitude of the upper vertex

Solution:

In solving latitude of the upper vertex, we have to use the course to subtract to 90° or 270° depending to the direction where the ship is going.

Upper vertex latitude = 90° - 051°
                                 = 38° 12'

For the longitude, just copy the figure and change the name of the longitude.



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3 comments:

  1. There was a clerical error by the author, i believe. Take a look at the photo. The course is 051.8. But the author mistyped. Instead of 051.8 true course, 051 was written.
    So 90 degree minus 051.8 degree equals 38 degrees and 12 minutes

    Again, read the problem from the photo.

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