19 lines
659 B
Text
19 lines
659 B
Text
/* Haversine formula, in Jsish */
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function haversine() {
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var radians = arguments.map(function(deg) { return deg/180.0 * Math.PI; });
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var lat1 = radians[0], lon1 = radians[1], lat2 = radians[2], lon2 = radians[3];
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var R = 6372.8; // km
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var dLat = lat2 - lat1;
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var dLon = lon2 - lon1;
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var a = Math.sin(dLat / 2) * Math.sin(dLat /2) + Math.sin(dLon / 2) * Math.sin(dLon /2) * Math.cos(lat1) * Math.cos(lat2);
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var c = 2 * Math.asin(Math.sqrt(a));
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return R * c;
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}
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;haversine(36.12, -86.67, 33.94, -118.40);
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/*
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=!EXPECTSTART!=
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haversine(36.12, -86.67, 33.94, -118.40) ==> 2887.259950607112
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=!EXPECTEND!=
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*/
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