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34 lines
606 B
Markdown
34 lines
606 B
Markdown
[**pray-calc v2.1.1**](../README.md)
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***
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[pray-calc](../README.md) / toJulianDate
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# Function: toJulianDate()
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> **toJulianDate**(`date`): `number`
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Defined in: [getSolarEphemeris.ts:22](https://github.com/acamarata/pray-calc/blob/4227afc2c3993234794b3a1a561c080edc6d4d4e/src/getSolarEphemeris.ts#L22)
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Convert a JavaScript Date to a Julian Date number.
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## Parameters
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### date
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`Date`
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Any JavaScript Date object (uses UTC internally)
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## Returns
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`number`
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Julian Date: days since noon January 1, 4713 BC UTC
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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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// jd ≈ 2460482.5
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```
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