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36 lines
829 B
Markdown
36 lines
829 B
Markdown
[**pray-calc v2.1.1**](../README.md)
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***
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[pray-calc](../README.md) / solarEphemeris
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# Function: solarEphemeris()
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> **solarEphemeris**(`jd`): `SolarEphemeris`
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Defined in: [getSolarEphemeris.ts:46](https://github.com/acamarata/pray-calc/blob/af34aef986c37d8de9cf8db0744a41e3b0c99c40/src/getSolarEphemeris.ts#L46)
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Compute solar declination, Earth-Sun distance, and ecliptic longitude
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from a Julian Date. Accuracy: ~0.01° for declination, ~0.0001 AU for r.
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## Parameters
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### jd
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`number`
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Julian Date (use toJulianDate to convert a JS Date)
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## Returns
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`SolarEphemeris`
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Solar ephemeris data: declination (degrees), Earth-Sun distance (AU),
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and ecliptic longitude (radians, 0-2π season phase)
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## Example
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```ts
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const jd = toJulianDate(new Date('2024-06-21'));
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const { decl, r, eclLon } = solarEphemeris(jd);
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```
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