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=head2 AXIS_SM_LUNAR

    3.84402e8

lunar orbital semi-major axis

This constant is also available using the alternate name C<LUNAR_SM_AXIS>
(imported using the :alternate tag for backwards compatibility)

=head2 ECCENTRICITY_LUNAR

    0.0549

lunar orbital eccentricity

This constant is also available using the alternate name C<LUNAR_ECCENTRICITY>
(imported using the :alternate tag for backwards compatibility)

=head2 THOMSON_CROSS_SECTION

    6.6524587321e-29

Thomson cross-section

This constant is also available using the alternate name C<THOMSON_XSECTION>
(imported using the :alternate tag for backwards compatibility)

=head2 MASS_ELECTRON

    9.1093837015e-31

mass of electron

This constant is also available using the alternate name C<ELECTRON_MASS>
(imported using the :alternate tag for backwards compatibility)

=head2 MASS_PROTON

    1.67262192369e-27

mass of proton

This constant is also available using the alternate name C<PROTON_MASS>
(imported using the :alternate tag for backwards compatibility)

=head2 MASS_NEUTRON

    1.67492749804e-27

neutron mass

This constant is also available using the alternate name C<NEUTRON_MASS>
(imported using the :alternate tag for backwards compatibility)

=head2 MASS_HYDROGEN

    1.6738e-27

mass of Hydrogen atom --
This value is from the IUPAC and is a little smaller than MASS_PROTON + MASS_ELECTRON, but within the uncertainty given here.  The current value is 1.008u +/- 0.0002 derived from a range of terrestrial materials.  If this is for precision work, you h...

This constant is also available using the alternate name C<HYDROGEN_MASS>
(imported using the :alternate tag for backwards compatibility)

=head2 MASS_ALPHA

    6.6446573357e-27

mass of alpha particle

=head2 RADIUS_ELECTRON

    2.8179403262e-15

classical electron radius

This constant is also available using the alternate name C<ELECTRON_RADIUS>
(imported using the :alternate tag for backwards compatibility)

=head2 RADIUS_BOHR

    5.29177210903e-11

Bohr radius

This constant is also available using the alternate name C<BOHR_RADIUS>
(imported using the :alternate tag for backwards compatibility)

=head2 RADIUS_JUPITER

    69911000

Volumetric mean radius of Jupiter

=head2 MASS_JUPITER

    1.89819e27

mass of Jupiter

=head1 EXPORT

Nothing is exported by default, so the module doesn't clobber any of your variables.
Select from the following tags:

=over 4

=item *

C<:all>             (everything except :deprecated)

=item *

C<:fundamental>

=item *

C<:conversion>

=item *

C<:mathematics>

=item *

C<:cosmology>

=item *

C<:planetary>

=item *

C<:electromagnetic>

=item *

C<:nuclear>

=item *

C<:alternates>

=item *

C<:deprecated>

=back

=head1 FUNCTIONS

=head2 pretty

This is a helper function that rounds a value or list of values to 5 significant figures.

=head2 precision

Give this method the string of the constant and it returns the precision or uncertainty
listed.

  $rel_precision = precision('GRAVITATIONAL');
  $abs_precision = precision('MASS_EARTH');

At the moment you need to know whether the uncertainty is relative or absolute.
Looking to fix this in future versions.

=head2 Deprecated functions

I've gotten rid of C<list_constants> and C<describe_constants> because they are now in
the documentation.  Use C<perldoc Astro::Constants> for that information.

=head1 SEE ALSO

=over 4

=item *

L<Astro::Cosmology>

=item *

L<Perl Data Language|PDL>

=item *

L<NIST|http://physics.nist.gov>

=item *

L<Astronomical Almanac|http://asa.usno.navy.mil>

=item *

L<IAU 2015 Resolution B3|http://iopscience.iop.org/article/10.3847/0004-6256/152/2/41/meta>

=item *

L<Neil Bower's review on providing read-only values|http://neilb.org/reviews/constants.html>

=item *

L<Test::Number::Delta>

=item *

L<Test::Deep::NumberTolerant> for testing values within objects

=back

Reference Documents:

=over 4

=item *

L<IAU 2009 system of astronomical constants|http://aa.usno.navy.mil/publications/reports/Luzumetal2011.pdf>

=item *

L<Astronomical Constants 2016|http://asa.usno.navy.mil/static/files/2016/Astronomical_Constants_2016.pdf>

=item *

L<IAU recommendations concerning units|https://www.iau.org/publications/proceedings_rules/units>