moon-cycle/.github/wiki/api/variables/MONTH_ANCHOR.md
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[**moon-cycle v2.0.0**](../README.md)
***
[moon-cycle](../README.md) / MONTH\_ANCHOR
# Variable: MONTH\_ANCHOR
> `const` **MONTH\_ANCHOR**: `Date`
Defined in: [types.ts:89](https://github.com/acamarata/moon-cycle/blob/800a74670ed6ac7b6d239efd6ec627dbb009fcea/src/types.ts#L89)
Anchor date for the monthly cycle: the 2023-11-13 new moon (UTC).
All synodic phase calculations measure elapsed time from this reference
point. Confirmed against JPL Horizons ephemeris data.
## Example
```ts
import { MONTH_ANCHOR } from 'moon-cycle';
const ageMs = Date.now() - MONTH_ANCHOR.getTime();
```