Half of a versed sine.
- For all intents and purposes, the haversine is the most accurate way to calculate distance on a sphere.
- The pulse shape is usually assumed to be of haversine, half-sine or some other tapered rectangular shape.
- Regardless of whether you choose to use the sight reduction tables or prefer the haversine formula you will require a nautical almanac.
Late 19th century: contraction of half versed sine.
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