Latitude Lesson With Vince

Question 1

Distance from EQ to Pole

Answer 1

10,000km

5400nm

Question 2

ChLong

Answer 2

The change of longitude

Question 3

ChLat

Answer 3

The change of Latitude

Question 4

Departure

Answer 4

Distance along parallels of latitude

DEP = ChLong’ (minutes) x Cos (lat)

Question 5

Geocentric Latitude

Answer 5

Latitude measured on a perfect sphere

Question 6

Geodetic / Geographic Latitude

Answer 6

Latitude measured on an oblate spheroid

At the poles and EQ the Geocentric and the Geodetic/Geographoc latitudes are equal

Biggest difference between them at 45 degrees N/S

Question 7

Convergency

Answer 7

The convergence of meridians
EQ=0 as they are parallel
Max value at the poles

The angle = the distance in longitude

Question 8

Convergency =

Answer 8

ChLong x Sin (mid) latitude

Track changes by the value of convergence as you fly great circles