What is the Colatitude Angle in Gravitation?

[cupid.callin]

Homework Statement

The Attempt at a Solution

Please someone help me to understand the question

 

[gneill]

Geostationary satellites have a specific orbital radius, and orbit in a particular plane. The Earth is spherical. As you travel northwards (or southwards), at what colatitude will the satellite drop below the viewing horizon?

 

[cupid.callin]

So which angle are we talking about?

 

[gneill]

Colatitude: http://en.wikipedia.org/wiki/Colatitude

 

[cupid.callin]

Hi gneill

can you mark the angle we are talking about in the image
its really getting hard for me to understand

is it this angle ? ...

viz sin^-1(.15)

 

[gneill]

See attached.