Module pnp 

Precession, nutation, polar motion

Functions

bi00

Frame bias components, IAU 2000

bp00

Frame bias and precession matrices, IAU 2000.

bp06

Frame bias and precession, IAU 2006.

bpn2xy

Extract CIP X,Y coordinates from NPB matrix

c2i00a

Form the celestial-to-intermediate matrix for a given date using the IAU 2000A precession-nutation model.

c2i00b

Form the celestial-to-intermediate matrix for a given date using the IAU 2000B precession-nutation model.

c2i06a

Form the celestial-to-intermediate matrix for a given date using the IAU 2006 precession and IAU 2000A nutation models.

c2ibpn

Form the celestial-to-intermediate matrix for a given date given the bias-precession-nutation matrix. IAU 2000.

c2ixy

Form the celestial to intermediate-frame-of-date matrix for a given date when the CIP X,Y coordinates are known. IAU 2000.

c2ixys

Celestial−to−intermediate matrix, given X,Y, IAU 2000

c2t00a

Form the celestial to terrestrial matrix given the date, the UT1 and the polar motion, using the IAU 2000A precession-nutation model.

c2t00b

Form the celestial to terrestrial matrix given the date, the UT1 and the polar motion, using the IAU 2000B precession-nutation model.

c2t06a

Form the celestial to terrestrial matrix given the date, the UT1 and the polar motion, using the IAU 2006/2000A precession-nutation model.

c2tcio

Assemble the celestial to terrestrial matrix from CIO-based components (the celestial-to-intermediate matrix, the Earth Rotation Angle and the polar motion matrix).

c2teqx

Assemble the celestial to terrestrial matrix from equinox-based components (the celestial-to-true matrix, the Greenwich Apparent Sidereal Time and the polar motion matrix).

c2tpe

Form the celestial to terrestrial matrix given the date, the UT1, the nutation and the polar motion. IAU 2000.

c2txy

Form the celestial to terrestrial matrix given the date, the UT1, the CIP coordinates and the polar motion. IAU 2000.

eo06a

Equation of the origins, IAU 2006 precession and IAU 2000A nutation.

eors

Equation of the origins, given the classical NPB matrix and the quantity s.

fw2m

Form rotation matrix given the Fukushima-Williams angles.

fw2xy

CIP X,Y given Fukushima-Williams bias-precession-nutation angles.

ltp

Long-term precession matrix.

ltpb

Long-term precession matrix, including ICRS frame bias.

ltpecl

Long-term precession of the ecliptic.

ltpequ

Long-term precession of the equator.

num00a

Form the matrix of nutation for a given date, IAU 2000A model.

num00b

Form the matrix of nutation for a given date, IAU 2000B model.

num06a

Form the matrix of nutation for a given date, IAU 2006/2000A model.

numat

Form the matrix of nutation.

nut00a

Nutation, IAU 2000A

nut00b

nutation, IAU 2000B

nut06a

IAU 2000A nutation with adjustments to match the IAU 2006 precession.

nut80

Nutation, IAU 1980 model.

nutm80

Form the matrix of nutation for a given date, IAU 1980 model.

obl06

Mean obliquity of the ecliptic, IAU 2006 precession model.

obl80

Mean obliquity of the ecliptic, IAU 1980 model.

p06e

Precession angles, IAU 2006, equinox based.

pb06

This function forms three Euler angles which implement general precession from epoch J2000.0, using the IAU 2006 model. Frame bias (the offset between ICRS and mean J2000.0) is included.

pfw06

Precession angles, IAU 2006 (Fukushima-Williams 4-angle formulation).

pmat00

Precession matrix (including frame bias) from GCRS to a specified date, IAU 2000 model.

pmat06

Precession matrix (including frame bias) from GCRS to a specified date, IAU 2006 model.

pmat76

Precession matrix from J2000.0 to a specified date, IAU 1976 model.

pn00

Bias/precession/nutation results, IAU 2000

pn00a

Bias/precession/nutation, IAU 2000A

pn00b

Bias/precession/nutation, IAU 2000B

pn06

Precession-nutation, IAU 2006 model: a multi-purpose function, supporting classical (equinox-based) use directly and CIO-based use indirectly.

pn06a

Precession-nutation, IAU 2006/2000A models: a multi-purpose function, supporting classical (equinox-based) use directly and CIO-based use indirectly.

pnm00a

Classical NPB matrix, IAU 2000A

pnm00b

Form the matrix of precession-nutation for a given date (including frame bias), equinox-based, IAU 2000B model.

pnm06a

Classical NPB matrix, IAU 2006/2000A

pnm80

Form the matrix of precession/nutation for a given date, IAU 1976 precession model, IAU 1980 nutation model.

pom00

Form the matrix of polar motion for a given date, IAU 2000.

pr00

Precession-rate part of the IAU 2000 precession-nutation models (part of MHB2000).

prec76

IAU 1976 precession model.

s00

The CIO locator s, positioning the Celestial Intermediate Origin on the equator of the Celestial Intermediate Pole, given the CIP’s X,Y coordinates. Compatible with IAU 2000A precession-nutation.

s00a

The CIO locator s, positioning the Celestial Intermediate Origin on the equator of the Celestial Intermediate Pole, using the IAU 2000A precession-nutation model.

s00b

The CIO locator s, positioning the Celestial Intermediate Origin on the equator of the Celestial Intermediate Pole, using the IAU 2000B precession-nutation model.

s06

The CIO locator s, positioning the Celestial Intermediate Origin on the equator of the Celestial Intermediate Pole, given the CIP’s X,Y coordinates. Compatible with IAU 2006/2000A precession-nutation.

s06a

The CIO locator s, positioning the Celestial Intermediate Origin on the equator of the Celestial Intermediate Pole, using the IAU 2006 precession and IAU 2000A nutation models.

sp00

The TIO locator s’, positioning the Terrestrial Intermediate Origin on the equator of the Celestial Intermediate Pole.

xy06

X,Y coordinates of celestial intermediate pole from series based on IAU 2006 precession and IAU 2000A nutation.

xys00a

For a given TT date, compute the X,Y coordinates of the Celestial Intermediate Pole and the CIO locator s, using the IAU 2000A precession-nutation model.

xys00b

For a given TT date, compute the X,Y coordinates of the Celestial Intermediate Pole and the CIO locator s, using the IAU 2000B precession-nutation model.

xys06a

For a given TT date, compute the X,Y coordinates of the Celestial Intermediate Pole and the CIO locator s, using the IAU 2006 precession and IAU 2000A nutation models.