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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
# Example: Solar Position Logger
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Print solar position every 30 minutes throughout a day.
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```js
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import { calcSpa } from 'nrel-spa';
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const LAT = 40.7128; // New York
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const LON = -74.0060;
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const TZ = -4; // EDT
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const date = new Date('2025-06-21T00:00:00-04:00');
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console.log('Time (local) Zenith Azimuth');
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console.log('──────────── ──────── ────────');
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for (let hour = 4; hour <= 21; hour++) {
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for (const min of [0, 30]) {
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const d = new Date(date);
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d.setHours(hour, min, 0, 0);
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const r = calcSpa(d, LAT, LON, TZ);
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const timeStr = `${String(hour).padStart(2, '0')}:${String(min).padStart(2, '0')}`;
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const zenith = Number(r.zenith).toFixed(1).padStart(7);
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const azimuth = Number(r.azimuth).toFixed(1).padStart(7);
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console.log(`${timeStr} ${zenith}° ${azimuth}°`);
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}
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}
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```
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Sample output (abbreviated):
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```
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Time (local) Zenith Azimuth
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──────────── ──────── ────────
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05:30 89.3° 60.2°
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06:00 83.1° 68.4°
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12:00 24.6° 185.1°
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13:00 26.1° 212.3°
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20:00 83.8° 293.7°
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```
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