pyacs.lib.astrotime.cal2mjd

Convert a calendar date (universal time) to modified Julian day (JD-2400000.5).

pyacs.lib.astrotime.cal2mjd.cal2mjd(day, month, year, ut=0.5)[source]

Convert a calendar date (universal time) to modified Julian day (JD-2400000.5).

Parameters:

day (int or array-like) – Day of month.
month (int or array-like) – Month (1-12).
year (int or array-like) – Year.
ut (float, optional) – Day fraction in [0., 1.[. Default 0.5 (middle of day).

Returns:

Modified Julian day.

Return type:

float or ndarray

Notes

When ut is not provided, the middle of the day is used.

Examples

>>> import pyacs
>>> pyacs.cal2mjd(29,2,2000)
>>> 51603.5
>>> pyacs.cal2mjd(29,2,2000,ut=0.0)
>>> 51603.0