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https://issues.apache.org/jira/browse/LUCENE-7194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231999#comment-15231999
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Robert Muir commented on LUCENE-7194:
-------------------------------------
{quote}
This is a simple multiplication, computed using two well-known constants: pi
and 180.0. How can this possibly be inexact??
{quote}
See the linked openjdk issue. Looks like they changed it from division to
inverse multiplication.
IMO at least StrictMath should not have this optimization...
> Ban Math.toRadians/toDegrees and remove all usages of it
> --------------------------------------------------------
>
> Key: LUCENE-7194
> URL: https://issues.apache.org/jira/browse/LUCENE-7194
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> The result of these methods is unreliable and changes across jvm versions: we
> cannot use these methods.
> The following program prints 0.7722082215479366 on previous versions of java
> but 0.7722082215479367 on java 9 because Math.toRadians is no longer doing
> the same thing:
> {code}
> public class test {
> public static void main(String args[]) throws Exception {
> System.out.println(Math.toRadians(44.244272));
> }
> }
> {code}
> This is because of https://bugs.openjdk.java.net/browse/JDK-4477961.
> I am not really sure its a bug, because the method says that the conversion
> is "generally inexact".
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