pyacs.lib.astrotime.dayno2decyear

Convert day of year and year to decimal year.

pyacs.lib.astrotime.dayno2decyear.dayno2decyear(dayno, year, ut=0.5)[source]

Convert day of year and year to decimal year.

Parameters:

dayno (int or array-like) – Day of year.
year (int or array-like) – Year.
ut (float, optional) – Day fraction. Default 0.5 (12:00).

Returns:

Decimal year.

Return type:

float or ndarray

Notes

Accounts for leap years (366 days). Unless ut is specified, the result is at 12:00 (ut=0.5).

Examples

>>> import pyacs
>>> pyacs.dayno2decyear(60,1999)
>>> 1999.16301369863
>>> pyacs.dayno2decyear(60,2000)
>>> 2000.1625683060108
>>> pyacs.dayno2decyear(60,2001)
>>> 2001.16301369863
>>> pyacs.dayno2decyear(60,2001,ut=0.)
>>> 2001.1616438356164