moon-sighting/.github/wiki/api/variables/YALLOP_THRESHOLDS.md
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[**moon-sighting v1.1.1**](../README.md)
***
[moon-sighting](../README.md) / YALLOP\_THRESHOLDS
# Variable: YALLOP\_THRESHOLDS
> `const` **YALLOP\_THRESHOLDS**: `object`
Defined in: [types.ts:155](https://github.com/acamarata/moon-sighting/blob/89fb490051d0263a7d41c954161fb945f1569805/src/types.ts#L155)
Published q thresholds (Yallop 1997, NAO TN 69):
A: q > +0.216 — Easily visible to the naked eye
B: q > -0.014 — Visible under perfect conditions
C: q > -0.160 — May need optical aid to find; visible to naked eye
D: q > -0.232 — Optical aid needed; will not be visible to naked eye
E: q > -0.293 — Not visible even with telescope
F: q <= -0.293 — Below Danjon limit (Moon too close to Sun)
## Type Declaration
### A
> `readonly` **A**: `0.216` = `0.216`
### B
> `readonly` **B**: `-0.014` = `-0.014`
### C
> `readonly` **C**: `-0.16` = `-0.16`
### D
> `readonly` **D**: `-0.232` = `-0.232`
### E
> `readonly` **E**: `-0.293` = `-0.293`