TimeDecimalYear

class astropy.time.TimeDecimalYear(val1, val2, scale, precision, in_subfmt, out_subfmt, from_jd=False)

Bases: TimeNumeric

Time as a decimal year, with integer values corresponding to midnight of the first day of each year.

For example 2000.5 corresponds to the ISO time ‘2000-07-02 00:00:00’.

Since for this format the length of the year varies between 365 and 366 days, it is not possible to use Quantity input, in which a year is always 365.25 days.

Attributes Summary

in_subfmt
jd1
jd2
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

in_subfmt

jd1

jd2

name = 'decimalyear'

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.