Great-Circle Vertex
Highest-latitude point (vertex) of a great-circle track - where the track runs true east-west. Napier's Rules of circular parts.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Any known latitude on the track | ° | |
| Initial course at that point | °T | |
| Vertex (highest) latitude | ° |
Source: Bowditch - American Practical Navigator Ch.24
In short
Highest-latitude point (vertex) of a great-circle track - where the track runs true east-west.