Articles about distances, maps and how they are measured
Plain-language articles on how distances between places are calculated: the haversine formula, great circles, road versus straight-line distance and more.
Why do planes seem to fly in a curve?
Why a flight route looks curved on a map, what the haversine formula does about it, and a map you can drag to watch the distance change. No equations.
Read the articleHaversine calculator: formula step by step, with a map
An interactive haversine calculator that recomputes every step of the formula as you drag two points, plus the New York–London worked example.
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