L0

sunpy.coordinates.sun.L0(time='now') [edit on github]

Return the L0 angle for the Sun at a specified time, which is the Carrington longitude of the Sun-disk center as seen from Earth.

Parameters

time (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

Returns

Longitude – The Carrington longitude

Notes

This longitude is calculated using the values from Siedelmann et al. (2007), with care taken to use the longitude as seen from Earth (see that paper’s Appendix).

References

  • Siedelmann et al. (2007), “Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements: 2006” (link)