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https://issues.apache.org/jira/browse/LUCENE-7158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220782#comment-15220782
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Nicholas Knize commented on LUCENE-7158:
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I also propose refactoring {{SloppyMath.haversin}} to {{o.a.l.geo.GeoUtils}} in
core. It's only used for Geo and the reusable WGS constants live in that class.
> 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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