thesky_moonroutines Module Reference

Procedures for the Moon. More...

Functions/Subroutines
subroutine	moonphys (jd, libl, libb, pa, blpa, sunl, sunb, jdeqnx)
	Get physical data for the Moon: librations, position angles, selenographic position of the Sun.
real(double) function	moonphase (k0)
	Calculates Julian Day of phase of the Moon for the desired phase k0.
real(double) function	moon_age (jd)
	Compute the age of the Moon for a given JD.
subroutine	moon_phase_next (jd, phase, jdnext)
	Compute the next lunar phase after a given JD.

Detailed Description

Procedures for the Moon.

Function/Subroutine Documentation

moon_age()

real(double) function thesky_moonroutines::moon_age

(

real(double), intent(in)

jd

)

Compute the age of the Moon for a given JD.

Parameters

jd	Julian day for computation

Return values

moon_age

Age of the Moon (since last New Moon) in days

Definition at line 376 of file moon_routines.f90.

References moon_age(), and moonphase().

Referenced by moon_age().

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moon_phase_next()

subroutine thesky_moonroutines::moon_phase_next	(	real(double), intent(in)	jd,
		integer, intent(out)	phase,
		real(double), intent(out)	jdnext )

Compute the next lunar phase after a given JD.

Parameters

JD	Julian day for computation
phase	Next lunar phase: 0-NM ... 3-LQ (output)
JDnext	Julian day of next lunar phase (output)

Definition at line 409 of file moon_routines.f90.

References moonphase(), and thesky_datetime::printdate1().

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moonphase()

real(double) function thesky_moonroutines::moonphase

(

real(double), intent(in)

k0

)

Calculates Julian Day of phase of the Moon for the desired phase k0.

Parameters

k0	Desired phase: x.00: New Moon - k = x.75: Last Quarter. k=0 ~ 2000.0

Return values

moonphase

JD of the desired lunar phase

See also

Meeus, Astronomical Algorithms, 1998, Ch. 49

Note

• First version: June 2003

Definition at line 211 of file moon_routines.f90.

References thesky_local::deltat, and moonphase().

Referenced by moon_age(), moon_phase_next(), and moonphase().

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moonphys()

subroutine thesky_moonroutines::moonphys	(	real(double), intent(in)	jd,
		real(double), intent(out)	libl,
		real(double), intent(out)	libb,
		real(double), intent(out)	pa,
		real(double), intent(out)	blpa,
		real(double), intent(out)	sunl,
		real(double), intent(out)	sunb,
		real(double), intent(in), optional	jdeqnx )

Get physical data for the Moon: librations, position angles, selenographic position of the Sun.

Parameters

jd	Julian day for computation (epoch)
libl	Libration (physical+optical) in longitude (output)
libb	Libration (physical+optical) in latitude (output)
pa	Position angle of the Moon's axis/north pole w.r.t. an equatorial grid (output)
blpa	Position angle of the Moon's bright limb w.r.t. an equatorial grid (output)
sunl	Selenographic longitude of the Sun (output)
sunb	Selenographic latitude of the Sun (output)
jdEqnx	Julian day for equinox (optional; default: jd = JD of epoch)

See also

Meeus, Astronomical Algorithms, 1998, Ch. 53

Note

This routine does NOT save Moon data in planpos !!!

Definition at line 51 of file moon_routines.f90.

References thesky_planetdata::nplanpos, thesky_planets::planet_position(), thesky_planetdata::planpos, thesky_coordinates::precess_ecl(), and thesky_coordinates::precess_eq().

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