earth_orientation_table

class astropy.utils.iers.earth_orientation_table

Bases: ScienceState

Default IERS table for Earth rotation and reference systems service.

These tables are used to calculate the offsets between UT1 and UTC and for conversion to Earth-based coordinate systems.

The state itself is an IERS table, as an instance of one of the IERS classes. The default, the auto-updating IERS_Auto class, should suffice for most purposes.

Examples

To temporarily use the IERS-B file packaged with astropy:

>>> from astropy.utils import iers
>>> from astropy.time import Time
>>> iers_b = iers.IERS_B.open(iers.IERS_B_FILE)
>>> with iers.earth_orientation_table.set(iers_b):
...     print(Time('2000-01-01').ut1.isot)
2000-01-01T00:00:00.355

To use the most recent IERS-A file for the whole session:

>>> iers_a = iers.IERS_A.open(iers.IERS_A_URL)  
>>> iers.earth_orientation_table.set(iers_a)  
<ScienceState earth_orientation_table: <IERS_A length=17463>...>

To go back to the default (of IERS_Auto):

>>> iers.earth_orientation_table.set(None)  
<ScienceState earth_orientation_table: <IERS_Auto length=17428>...>

Methods Summary

validate(value)

Validate the value and convert it to its native type, if necessary.

Methods Documentation

classmethod validate(value)

Validate the value and convert it to its native type, if necessary.