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Fix astropy#9206 by making IERS B use deterministic
IERS_Auto merges in columns from the IERS B table. But as it stood, the version of IERS B that was used was difficult to control. Now it always uses the version built in to astropy.
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‎astropy/utils/iers/iers.py‎

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@@ -818,7 +818,7 @@ def _substitute_iers_b(cls, table):
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Here, we use the bundled astropy IERS-B table to overwrite the values
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in the downloaded IERS-A table.
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"""
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iers_b = IERS_B.open()
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iers_b = IERS_B.open(IERS_B_FILE)
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# Substitute IERS-B values for existing B values in IERS-A table
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mjd_b = table['MJD'][~table['UT1_UTC_B'].mask]
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i0 = np.searchsorted(iers_b['MJD'].value, mjd_b[0], side='left')

‎astropy/utils/iers/tests/test_iers_b_into_auto.py‎

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@@ -105,6 +105,7 @@ def test_IERS_B_parameters_loaded_into_IERS_Auto_correctly(
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b_name,
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a_name,
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atol):
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IERS_Auto.iers_table = None
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A = IERS_Auto.open()
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A[a_name]
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B = IERS_B.open(IERS_B_FILE)

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