I need to interpolate lat/lon points along a small circle, with a given centre and radius. I've successfully used these formulas for great circles. What is the equivalent for small circles?

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    How much accuracy do you need? How small is "small"? – whuber Sep 22 '11 at 6:37

Have a look at the answers to this question - Calculating Lat/Lng X miles from point. Using one of the formulas for calculating location from bearing and distance, with a fixed distance and varying bearings, will give you the points of your small circle.

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