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26 lines
770 B
Markdown
26 lines
770 B
Markdown
[**moon-cycle v2.0.0**](../README.md)
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***
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[moon-cycle](../README.md) / SYNODIC\_MONTH
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# Variable: SYNODIC\_MONTH
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> `const` **SYNODIC\_MONTH**: `29.53058821398858` = `29.53058821398858`
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Defined in: [types.ts:51](https://github.com/acamarata/moon-cycle/blob/208f7ffba1c1bce684a1b90ff94e52538d2632d3/src/types.ts#L51)
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Length of one synodic month in days.
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IAU mean value at J2000.0. Used by `cycleMonth` to divide the elapsed
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time into a fractional position within the current lunar cycle.
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## Example
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```ts
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import { SYNODIC_MONTH } from 'moon-cycle';
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// Days old: how far into the current cycle
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const now = new Date();
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const elapsed = (now.getTime() - MONTH_ANCHOR.getTime()) / 86400000;
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const age = ((elapsed % SYNODIC_MONTH) + SYNODIC_MONTH) % SYNODIC_MONTH;
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```
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