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33 lines
884 B
Markdown
33 lines
884 B
Markdown
# Example: Twilight Times
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Compute civil, nautical, and astronomical twilight for a location.
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```js
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import { getSpa, formatTime } from 'nrel-spa';
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const LAT = 34.0522; // Los Angeles
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const LON = -118.2437;
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const TZ = -7; // PDT
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const date = new Date('2025-09-15T12:00:00-07:00');
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const r = getSpa(date, LAT, LON, TZ, {}, [90.833, 96, 102, 108]);
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const labels = ['Sunrise/Sunset', 'Civil', 'Nautical', 'Astronomical'];
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for (let i = 0; i < r.customAngles.length; i++) {
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const ca = r.customAngles[i];
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const rise = formatTime(ca.sunrise);
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const set = formatTime(ca.sunset);
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console.log(`${labels[i].padEnd(16)} dawn: ${rise} dusk: ${set}`);
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}
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```
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Sample output:
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```
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Sunrise/Sunset dawn: 06:30:42 dusk: 19:12:18
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Civil dawn: 06:04:11 dusk: 19:38:49
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Nautical dawn: 05:33:07 dusk: 20:09:53
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Astronomical dawn: 05:01:19 dusk: 20:41:41
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```
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