;+
; NAME: lstnow
;
; PURPOSE:
; 	return current lst, for a given observatory
;
; INPUTS:
; KEYWORDS:
; OUTPUTS:
;
; HISTORY:
; 	Began 2005-07-14 17:30:20 by Marshall Perrin 
;-

FUNCTION lstnow,obsname=obsname,longitude=longitude

	if ~(keyword_set(longitude)) and ~(keyword_set(obsname)) then obsname="lick"

	if keyword_set(obsname) then begin
		observatory,obsname,obs
		longitude=obs.longitude
	endif
	if ~(keyword_set(longitude)) then message,"Need to set longitude!"
	tz_offset = gmt_offsec()/3600.

	; julday() doesn't know about timezones, so adjust the
	; returned value as necessary
	jdnow = julday()+tz_offset/24.

	ct2lst,lst,longitude*(-1),tz_offset,jdnow
	return,lst
	

end