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import adjust_lon from './adjust_lon';
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export default function(zone, lon) {
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if (zone === undefined) {
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zone = Math.floor((adjust_lon(lon) + Math.PI) * 30 / Math.PI) + 1;
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if (zone < 0) {
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return 0;
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} else if (zone > 60) {
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return 60;
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}
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}
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return zone;
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}
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