Michael McCandless created LUCENE-7158:
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Summary: Haversin should use the earth's mean radius, not its max
(equitorial)?
Key: LUCENE-7158
URL: https://issues.apache.org/jira/browse/LUCENE-7158
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
Across our spatial modules we seem to disagree about the earth's radius when we
model it as a sphere.
I think in our haversin implementation we use equitorial (maximum) radius, but
maybe in spatial3d we use the earth's mean radius.
I think mean makes more sense: the earth is actually a squashed sphere, so it's
polar radius is shorter than its equitorial radius.
I think it's important, when we model the earth as a sphere, that we pick one
radius and try to use that one consistently?
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