Hey All
This may seem a bit easy for some but I need a pointer, as I have never studied trigonometry.
Convergency Formula?
Q. Find the Convergency between 40 N 025 W & 60 N 060 E
Apparently this is done by:
Change of long x sin mean lat
= 85 x sin 50
= 85 x 0.7660
=65
My question is how did this calculate .7660? I am missing the mathematical calculation of sin?
Same for this one as well.
Departure Formula
Find the departure between 47S 113 E & 47S 172 W
I can calculate the first part fine.
EG 113+172=285
Higher that 180 so 360 -285=75
75x60=4500
This is the bit I cannot get
CHANGE OF LONGITUDE X COS LAT?
=4500 X COS 47
= 3069 nm?
How do you get 3069?
Im sure its easy when you know how. (Scientific calculator is not the answer, as you cannot take these into the exams)
Any pointers
Cheers
YYZ
