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and the sidereal day.

=item b)

Re-do the computation but compute the Sun's RA and Decl, and also GMST0, for the moment
of sunrise or sunset last computed.

=item c)

Iterate b) until the computed sunrise or sunset no longer changes significantly.
Usually 2 iterations are enough, in rare cases 3 or 4 iterations may be needed.

=back

However, I (second module maintainer) have checked with a few external
sources, to obtain test data. And actually, using the value 15.0 gives
results closer to what Stellarium  and the NOAA solar calculator give.
So I will use value 15.0, unless I find a bug in the precise algorithm
as presently implemented.

=head2 Notes on polar locations