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How to read it

The curves from N to S are great circles and the curves across are small circles, both every 10°. Pin tracing paper over the centre and mark your directions on it. To measure the angle between two of them, turn the tracing until both lie on the same great circle, then count the 10° steps between them along it. Because it keeps angles, not areas, use an equal-area net for counting how many points fall in a region.

40°NS
Two directions marked on the tracing, turned until both lie on the same great circle. The small circles cross it every 10°, and there are four steps between the marks, so the angle between them is 40°.

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