How do you determine your distance by parallel sailing when going from 42 38 0 north 162 51 east to 42 38 0 North 176 19 West

This is a great circle route and the distance can be calculated using the formula:

Distance = 60 * Arccos( Sin(Latitude1) * Sin(Latitude2) + Cos(Latitude1) * Cos(Latitude2) * Cos(Difference in Longitude) )

Where:

  • Latitude1 is the latitude of the starting point
  • Latitude2 is the latitude of the ending point
  • Difference in Longitude is the difference in longitude between the starting point and the ending point

In this case, the latitudes are the same, so the formula simplifies to:

Distance = 60 * Arccos(Cos(Latitude1) * Cos(Difference in Longitude))

Plugging in the values, we get:

Distance = 60 * Arccos(Cos(42.633333) * Cos(13.441667))

Distance = 1743.5 nautical miles

  1. What is the formula for calculating the distance between two points on a great circle route?
    • Distance = 60 * Arccos( Sin(Latitude1) * Sin(Latitude2) + Cos(Latitude1) * Cos(Latitude2) * Cos(Difference in Longitude) )
  2. What is the latitude of the starting point?
    • 42 38 0 North
  3. What is the longitude of the ending point?
    • 176 19 West
  4. What is the difference in longitude between the starting point and the ending point?
    • 13.441667 degrees
  5. What is the distance between the two points?
    • 1743.5 nautical miles
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