moon-sighting/.github/wiki/api/interfaces/CrescentGeometry.md
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[**moon-sighting v1.1.1**](../README.md)
***
[moon-sighting](../README.md) / CrescentGeometry
# Interface: CrescentGeometry
Defined in: [types.ts:118](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L118)
The five geometric quantities used by all major crescent visibility criteria.
All values computed at best time (T_b) unless noted.
## Properties
### ARCL
> **ARCL**: `number`
Defined in: [types.ts:120](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L120)
Arc of light: topocentric Sun-Moon angular separation (elongation), degrees
***
### ARCV
> **ARCV**: `number`
Defined in: [types.ts:125](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L125)
Arc of vision: Moon airless altitude minus Sun airless altitude, degrees.
Used as the primary visibility discriminant in both Yallop and Odeh.
***
### DAZ
> **DAZ**: `number`
Defined in: [types.ts:130](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L130)
Relative azimuth: Sun azimuth minus Moon azimuth, normalized to [-180, 180], degrees.
Positive = Moon north of Sun.
***
### lag
> **lag**: `number`
Defined in: [types.ts:137](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L137)
Moonset minus sunset in minutes. Negative = Moon sets before Sun (no sighting possible).
***
### W
> **W**: `number`
Defined in: [types.ts:135](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L135)
Topocentric crescent width in arc minutes.
Used directly in Odeh's polynomial V expression.