OBSERVING PERIODS- 2021
      (UT dates. Lick PST=UT-8h   Keck HST=UT-10h)
      --------------------------------------------
            DURATION       RUN           MOON
           FQ+1 to LQ      bright     PHASE  DATE
           LQ+1 to FQ      dark              (UT)
     ---------------------------------------------
     2020 Dec 22-Jan 06    BRIGHT    FULL   Dec 30
     2021 Jan 07-Jan 20    DARK      NEW    Jan 13
     2021 Jan 21-Feb 04    BRIGHT    FULL   Jan 28
     2021 Feb 05-Feb 19    DARK      NEW    Feb 11
     2021 Feb 20-Mar 06    BRIGHT    FULL   Feb 27
     2021 Mar 07-Mar 21    DARK      NEW    Mar 13
     2021 Mar 22-Apr 04    BRIGHT    FULL   Mar 28
     2021 Apr 05-Apr 20    DARK      NEW    Apr 12
     2021 Apr 21-May 03    BRIGHT    FULL   Apr 27
     2021 May 04-May 19    DARK      NEW    May 11
     2021 May 20-Jun 02    BRIGHT    FULL   May 26
     2021 Jun 03-Jun 18    DARK      NEW    Jun 10
     2021 Jun 19-Jul 01    BRIGHT    FULL   Jun 24
     2021 Jul 02-Jul 17    DARK      NEW    Jul 10
     2021 Jul 18-Jul 31    BRIGHT    FULL   Jul 24
     2021 Aug 01-Aug 15    DARK      NEW    Aug 08
     2021 Aug 16-Aug 30    BRIGHT    FULL   Aug 22
     2021 Aug 31-Sep 13    DARK      NEW    Sep 07
     2021 Sep 14-Sep 29    BRIGHT    FULL   Sep 20
     2021 Sep 30-Oct 13    DARK      NEW    Oct 06
     2021 Oct 14-Oct 28    BRIGHT    FULL   Oct 20
     2021 Oct 29-Nov 11    DARK      NEW    Nov 04
     2021 Nov 12-Nov 27    BRIGHT    FULL   Nov 19
     2021 Nov 28-Dec 11    DARK      NEW    Dec 04
     2021 Dec 12-Dec 27    BRIGHT    FULL   Dec 19
     2021 Dec 28-Jan 09    DARK      NEW    Jan 02
     ---------------------------------------------