Plot the great-circle route from Washington, D.C. (39 degree N, 77 degree W) to Moscow (56 degree N, 38 degree E).
a) what is the distance between the two cities? (radius of the earth= 6360 km)
b) what is the true bearing of an airplane flying from Washington to Moscow at the beginning , midpoint, and end of the trip? (The bearing is the angle measured clockwise from north to the flight direction. Thus east is 90 degree and west is 270 degree)
c) repeat for a trip from Los Angeles to a city outside North America.