;+
; NAME:
;	CarringtonLng
; PURPOSE:
;	Get Carrington (heliographic) longitude for given time T
; CALLING SEQUENCE:
	FUNCTION CarringtonLng, T, degrees=degrees
; INPUTS:
;	Yr				array; type: standard time structure
; OPTIONAL INPUT PARAMETERS:
;	/degrees			if set then then the output is in degrees
;						(default: radians)
; OUTPUTS:
;	R				array; type: float
;						Carrington (heliographic) longitude
; INCLUDE:
	@compile_opt.pro							; On error, return to caller
; CALLS:
;	Carrington, ToRadians
; SEE ALSO:
;	CarringtonNr
; PROCEDURE:
;	See CarringtonT0 for more details.
; MODIFICATION HISTORY:
;	DEC-2000, Paul Hick (UCSD/CASS)
;	JAN-2004, Paul Hick (UCSD/CASS; pphick@ucsd.edu)
;		Rewrite using new version of Carrington
;-
lng = Carrington(T, /get_fraction)
lng = (2*!dpi)*(1.0d0-lng)/ToRadians(degrees=degrees)

RETURN, lng  &  END