Spherical Math Book ?

[James D Davis]

I'm interested in earth map programming . For instance , on a rectangular projected earth map , its easy to place cities by lat & long , but harder to draw great & small earth circles like sunlight perimeters . Also for earth pictures taken from space : ? what is "map" projection ? math for lat&long points ? math for earth circles Please recommend good sphere math book for this . Thanks , Jim D

[ricecake]

Well, it's not a book, but there is an open-source project called Generic Mapping Tools (GMT)[^] that may be informative.

-- Marcus Kwok