Earth Orientation Parameters API

EarthOrientationData(mjds, xpoles, ypoles, ut1dutcs, dpsis, depss, final_date_range, predicted_date_range=None)

Bases: Module

Interpolation container for Earth Orientation Parameter (EOP) data.

Parameters:

Name	Type	Description	Default
tt_jds	Float[Array, n]	Sample JD values in TT.	required
xpoles	Float[Array, n]	Polar-motion coordinate xp in arcseconds.	required
ypoles	Float[Array, n]	Polar-motion coordinate yp in arcseconds.	required
ut1dutcs	Float[Array, n]	UT1-UTC offsets in seconds.	required
ut1dtts	Float[Array, n]	UT1-TT offsets in seconds.	required
dpsis	Float[Array, n]	Additive dPsi correction to the model nutation in longitude, in arcseconds.	required
depss	Float[Array, n]	Additive dEps correction to the model nutation in obliquity, in arcseconds.	required
final_date_range	Float[Array, 2]	Covered time range of the final data.	required
predicted_date_range	Optional[Float[Array, 2]]	Covered time range of the predicted data, if present.	None

xpole(tt_jd1, tt_jd2)

Interpolate the polar-motion coordinate xp.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in arcseconds.

ypole(tt_jd1, tt_jd2)

Interpolate the polar-motion coordinate yp.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in arcseconds.

ut1dtt(tt_jd1, tt_jd2)

Interpolate the UT1-TT offset.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in seconds.

ut1dutc(tt_jd1, tt_jd2)

Interpolate the UT1-UTC offset.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in seconds.

cor_delta_longitude(tt_jd1, tt_jd2)

Interpolate the additive dPsi correction to nutation in longitude.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in arcseconds.

cor_delta_obliquity(tt_jd1, tt_jd2)

Interpolate the additive dEps correction to nutation in obliquity.

Parameters:

Name	Type	Description	Default
tt_jd1	Float[Array, '']	Split Julian date of the UTC epoch.	required
tt_jd2	Float[Array, '']	Split Julian date of the UTC epoch.	required

Returns:

Type	Description
Float[Array, ...]	Interpolated value in arcseconds.

load_default_eop_file()

Return the cached default EOP table without performing network access.

load_iers_eopc04 = _eop_loaders.load_iers_eopc04 module-attribute

update_eop()

Download the latest default EOP table and replace the cached table.