maptimeBoston/better-know-a-slippy-map — pull request #1 by jwass (2014-06-24 14:03:46+00:00)
Title: Add note defining lat/lon variables in Mercator eq

Should mention the meaning of those variables.

You could add lambda is "like longitude" or something like that if you don't want to get explain the details... Feel free to fix as appropriate.