13 lines
439 B
TypeScript
13 lines
439 B
TypeScript
export function haversineNm(lat1: number, lon1: number, lat2: number, lon2: number) {
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const R = 3440.065; // nautical miles
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const dLat = ((lat2 - lat1) * Math.PI) / 180;
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const dLon = ((lon2 - lon1) * Math.PI) / 180;
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const a =
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Math.sin(dLat / 2) ** 2 +
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Math.cos((lat1 * Math.PI) / 180) *
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Math.cos((lat2 * Math.PI) / 180) *
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Math.sin(dLon / 2) ** 2;
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return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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}
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