carrington_rotation_number

sunpy.coordinates.sun.carrington_rotation_number(t='now')[source] [edit on github]

Return the Carrington rotation number. Each whole rotation number marks when the Sun’s prime meridian coincides with the central meridian as seen from Earth, with the first rotation starting on 1853 November 9.

Parameters

t (tuple, str, pandas.Timestamp, pandas.Series, pandas.DatetimeIndex, datetime.datetime, datetime.date, numpy.datetime64, numpy.ndarray, astropy.time.Time) – Time to use in a parse-time-compatible format