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    2.71828182846

base of natural logarithm

=head2 ATOMIC_MASS_UNIT

    1.66053906660e-27

unified atomic mass unit, 1 u

=head2 PARSEC

    3.08567758149e16

parsec

=head2 ASTRONOMICAL_UNIT

    149597870700

astronomical unit

=head2 LIGHT_YEAR

    9460730472580800

the distance that light travels in vacuum in one Julian year

=head2 ANGSTROM

    1e-10

Angstrom

=head2 JANSKY

    1e-26

Jansky, a unit of flux density

=head2 AVOGADRO

    6.02214076e23

Avogadro's number

=head2 YEAR

    31557600

defined as exactly 365.25 days of 86400 SI seconds

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

=head2 YEAR_TROPICAL

    31556925.1

the period of time for the ecliptic longitude of the Sun to increase 360 degrees, approximated by the Gregorian calendar

=head2 YEAR_SIDEREAL

    31558149.8

the period of revolution of the Earth around the Sun in a fixed reference frame

=head2 YEAR_ANOMALISTIC

    31558432.6

the period between successive passages of the Earth through perihelion

=head2 YEAR_ECLIPSE

    29947974.3

the period between successive passages of the Sun (as seen from the geocenter) through the same lunar node

=head2 MASS_SOLAR

    1.9884e30

solar mass

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

=head2 LUMINOSITY_SOLAR

    3.828e26

solar luminosity

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

=head2 DENSITY_CRITICAL_RHOC

    1.87834e-26

Critical Density parameter expressed in terms of

	      ρ_c / h² = 3 × (100 km s⁻¹ Mpc⁻¹)² / 8πG

Multiply by the square of the dimensionless Hubble parameter, h, in your calculations to get the actual value

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

=head2 HUBBLE_TIME

    3.0853056e17

Hubble time *h, the inverse of Hubble's constant valued at 100 km/s/Mpc (DEPRECATED - see ChangeLog)

=head2 TEMPERATURE_CMB

    2.72548