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65 lines
1.7 KiB
Markdown
65 lines
1.7 KiB
Markdown
[**moon-sighting v1.1.1**](../README.md)
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***
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[moon-sighting](../README.md) / CrescentGeometry
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# Interface: CrescentGeometry
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Defined in: [types.ts:118](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L118)
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The five geometric quantities used by all major crescent visibility criteria.
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All values computed at best time (T_b) unless noted.
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## Properties
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### ARCL
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> **ARCL**: `number`
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Defined in: [types.ts:120](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L120)
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Arc of light: topocentric Sun-Moon angular separation (elongation), degrees
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***
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### ARCV
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> **ARCV**: `number`
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Defined in: [types.ts:125](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L125)
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Arc of vision: Moon airless altitude minus Sun airless altitude, degrees.
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Used as the primary visibility discriminant in both Yallop and Odeh.
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***
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### DAZ
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> **DAZ**: `number`
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Defined in: [types.ts:130](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L130)
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Relative azimuth: Sun azimuth minus Moon azimuth, normalized to [-180, 180], degrees.
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Positive = Moon north of Sun.
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***
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### lag
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> **lag**: `number`
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Defined in: [types.ts:137](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L137)
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Moonset minus sunset in minutes. Negative = Moon sets before Sun (no sighting possible).
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***
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### W
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> **W**: `number`
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Defined in: [types.ts:135](https://github.com/acamarata/moon-sighting/blob/2992dcee216cb24cc74542f6e8d5a6f4f0d16e05/src/types.ts#L135)
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Topocentric crescent width in arc minutes.
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Used directly in Odeh's polynomial V expression.
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