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Calculate points along a great arc
along.great(phi1, lam0, c, Az)
List:
latitudes, radians
longitudes, radians
start lat, radians
start lon, radians
distance, radians
Azimuthal direction, radiansm
Jonathan M. Lees<jonathan.lees@unc.edu>
All input and output is radians
lat1 <- 48.856578 lon1 <- 2.351828 A = along.great(lat1*pi/180, lon1*pi/180, 50*pi/180, -63*pi/180) lat=A$phi*180/pi lon = A$lam*180/pi
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