[Proj] Distance measured in Mercator projection

Shannon Scott sscott at locationinc.com
Wed Jul 9 13:52:23 EDT 2008

Please forgive my ignorance, I know very  little about map projections.  
I apologize if this list is not the appropriate place to post this question.
If I understand correctly, in the Mercator projection, 1 unit of space 
is equal to 1 meter at the equator.
As you move away from the equator, the longitudinal lines are stretched 
to make the lat and long intersect at 90 degree angles.
How would I calculate the length in meters of 1 unit of space in the 
Mercator projection at a specific latitude?
Any advice of pointers are appreciated.
Thank you.

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