Ex-Meridian Latitude
Latitude from a sun altitude taken near (but not exactly at) meridian passage. Handy when cloud closes in at LAN.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Observed altitude | ° | |
| Declination | ° | |
| DR latitude | ° | |
| Local hour angle | ° | |
| Adjusted meridian altitude | ° |
Source: Bowditch - American Practical Navigator
In short
Latitude from a sun altitude taken near (but not exactly at) meridian passage.