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https://issues.apache.org/jira/browse/LUCENE-7158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221461#comment-15221461
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ASF subversion and git services commented on LUCENE-7158:
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Commit 4ecfa98bdbb3c00d6ab2b9fb9ebb27ec59031352 in lucene-solr's branch
refs/heads/branch_6x from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=4ecfa98 ]
LUCENE-7158: use the same value (from WGS84) for earth's mean radius when we
approximate it as a sphere
> 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
> Attachments: LUCENE-7158.patch, LUCENE-7158.patch
>
>
> 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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