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Half of a versed sine.
- ‘The calculation is done using the haversines formula.’
- ‘The pulse shape is usually assumed to be of haversine, half-sine or some other tapered rectangular shape.’
- ‘For all intents and purposes, the haversine is the most accurate way to calculate distance on a sphere.’
- ‘By the device of using versines instead of haversines in these tables it will be found that solutions of the astronomical triangle will be correct to within one minute of arc.’
- ‘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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