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Solving For The Difference Of Longitude (Dlo)

In latitude 50° 10' N, the departure between two meridians is 360 nautical miles. What is the Difference of Longitude?

 GIVEN:

   Latitude =  50° 10' 
Departure = 360 nm         

 WHAT IS ASKED:  Difference of longitude

 SOLUTION:

 This is the formula in solving for the difference of longitude:

 Dlo = (Dep/Cos lat) ÷ 60

 Step 1. Divide the departure by Cosine latitude.
           360 ÷ Cos 50° 10' = 562 nm

 Step 2. Divide the answer of step 1by 60 to convert it into degrees.
           562 ÷ 60 = 9° 22' is the difference of longitude (Dlo).
Difference of Longitude
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