TimeBesselianEpoch#

class astropy.time.TimeBesselianEpoch(val1, val2, scale, precision, in_subfmt, out_subfmt, from_jd=False)[source]#

Bases: TimeEpochDate

Besselian Epoch year as value(s) like 1950.0.

Since for this format the length of the year varies, input needs to be floating point; it is not possible to use Quantity input, for which a year always equals 365.25 days.

Attributes Summary

epoch_to_jd

in_subfmt

jd1

jd2

jd_to_epoch

name

out_subfmt

precision

scale

Time scale.

subfmts

value

Return time representation from internal jd1 and jd2.

Methods Summary

fill_value(subfmt)

Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.

set_jds(val1, val2)

Set internal jd1 and jd2 from val1 and val2.

to_value(**kwargs)

Return time representation from internal jd1 and jd2.

Attributes Documentation

epoch_to_jd = 'epb2jd'#
in_subfmt#
jd1#
jd2#
jd_to_epoch = 'epb'#
name = 'byear'#
out_subfmt#
precision#
scale#

Time scale.

subfmts = (('float', <class 'numpy.float64'>, None, <ufunc 'add'>), ('long', <class 'numpy.longdouble'>, <function longdouble_to_twoval>, <function twoval_to_longdouble>), ('decimal', <class 'numpy.object_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('str', <class 'numpy.str_'>, <numpy.vectorize object>, <numpy.vectorize object>), ('bytes', <class 'numpy.bytes_'>, <numpy.vectorize object>, <numpy.vectorize object>))#
value#

Methods Documentation

classmethod fill_value(subfmt)#

Return a value corresponding to J2000 (2000-01-01 12:00:00) in this format.

This is used as a fill value for masked arrays to ensure that any ERFA operations on the masked array will not fail due to the masked value.

set_jds(val1, val2)#

Set internal jd1 and jd2 from val1 and val2. Must be provided by derived classes.

to_value(**kwargs)#

Return time representation from internal jd1 and jd2. Subclasses that require parent or to adjust the jds should override this method.