Departure Flashcards
What is departure
Distance along a parallel or latitude (that’s not the equator)
What is the value of convergence angle at the equator
0
What is the value of convergence angle at the poles
Max
What is the equation for departure (NM)
Change of longitude (in mins) x cos latitude
What is a geocentric latitude
Line drawn from surface of earth to centre assuming perfect sphere
What is geographic latitude (geodetic)
Line joining the plane of equator to a position at the earths surface
Perpendicular to tangent of earths surface
Where is geocentric and geographic latitudes the same
At equator / poles
How do the rhumb line and great circle compare to each other
Rhumb line is always closer to the equator and the great circle track is always closer to the Pole
What is antipodal
2 points on earth opposite each other
What are the N/S antipodals of a great circle track
Vertices
If 2 points are antipodal how many number of great circle tracks are there
Infinite
What is a node
Point where great circle track crosses equator
Equation for convergence
Chlong x sin (mid) lat
What is convergency angle
Angle between rhumb line and great circle track
When is the rhumb line track and great circle track the parallel
Mid way
