Question

what's the formula for finding radius of a small circle?

Answer 1

what is small circle?

Answer 2

a circle around a sphere whose radius is not equal to the radius of the equator

Answer 3

lol is this funny?

Answer 4

no...

Answer 5

equator? you must be joking :D

Answer 6

you mean longitude and latitude ?

Answer 7

yea... latitudes, except the equator. all longitudes are great circles

Answer 8

yh, gr8 is this O lvl math ?

Answer 9

yh

Answer 10

wow, it's been a while. Alright w@s the question ?

Answer 11

http://upload.wikimedia.org/wikipedia/commons/7/7e/Sphere_wireframe_10deg_6r.svg

Answer 12

if A= latitude, radius of "small circle" is RcosA, R is the radius of the sphere

Answer 13

If you use nautical miles, the distance along the 40th parallel is 60*deg*60 nm/deg*cos(40º)
going south, the distance is 60 nm per degree

Answer 14

the delta in longitude between P(lat40N, lon38E) to another town Q(lat40N, lon22W) is 38+22= 60º

Answer 15

i found the formula i was in search of \(\huge R=rCos(\theta) \)

Answer 16

yh, th@s it. Thnx (phi) . Gr8 saso!