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56 lines
1.2 KiB
Markdown
56 lines
1.2 KiB
Markdown
[**moon-sighting v1.1.1**](../README.md)
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***
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[moon-sighting](../README.md) / getMoonPosition
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# Function: getMoonPosition()
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> **getMoonPosition**(`date?`, `lat`, `lon`, `elevation?`): [`MoonPosition`](../interfaces/MoonPosition.md)
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Defined in: [api/index.ts:539](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/api/index.ts#L539)
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Compute the Moon's topocentric position (azimuth, altitude, distance) for an observer.
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Works WITHOUT a kernel (uses Meeus Ch. 47 approximation).
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Accuracy: azimuth/altitude ~0.3°, distance ~300 km.
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For precision crescent work, use getMoonSightingReport() with the DE442S kernel.
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## Parameters
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### date?
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`Date` = `...`
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Date and time to compute position for (default: now)
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### lat
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`number`
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Observer geodetic latitude in degrees (north positive)
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### lon
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`number`
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Observer longitude in degrees (east positive)
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### elevation?
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`number` = `0`
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Observer height above WGS84 ellipsoid in meters (default: 0)
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## Returns
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[`MoonPosition`](../interfaces/MoonPosition.md)
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Topocentric az/alt (degrees), distance (km), parallactic angle (radians)
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## Example
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```ts
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const pos = getMoonPosition(new Date(), 51.5, -0.1)
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console.log(pos.azimuth, pos.altitude) // e.g. 212.4, 38.1
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```
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