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Re: Haversines with Logarithms
From: Roger W. Sinnott
Date: 2020 Oct 17, 21:22 +0000
From: Roger W. Sinnott
Date: 2020 Oct 17, 21:22 +0000
Brian Walton wrote:
> I am trying to replicate reduction systems used by my forefather
> in around 1890. Reversed sines ( versines) existed in antiquity.
> Not haversines, introduced in 1905. When did log-sin or log versine
> tables appear?
It seems that haversines go back further than 1905. The Oxford English Dictionary cites use of the term "haversine" in 1875, in Redford: Sailor's Pocket Book.
The graph from the Google Books Ngram Viewer shows a few blips for "haversine" as early as about 1845.
Roger
