*** Almanac for the currently specified date ***:
Almanac for Roque de los Muchachos:
long.   1 11 31 (h.m.s) W, lat.  28 45.5 (d.m), elev.  2326 m
pseudo-Greenwich Daylight Savings Time assumed from 2 AM on
2000 Mar 26 to 2 AM on 2000 Sep 24; standard zone =   0 hrs W

For the night of: Wed, 2000 Jun 21 ---> Thu, 2000 Jun 22
Local midnight = 2000 Jun 21, 23 hr UT, or JD 2451717.458
Local Mean Sidereal Time at midnight =  15 50 15.3

Sunset ( 2326 m horizon):   21 21 GDT; Sunrise:    7 06 GDT
Evening twilight:   22 47 GDT;  LMST at evening twilight:   14 37
Morning twilight:    5 40 GDT;  LMST at morning twilight:   21 31
12-degr twilight:  22 12 GDT -->   6 14 GDT; night center:    2 13 GDT

Moonrise:    0 34 GDT   
Moon at civil midnight: illuminated fraction 0.784
3.1 days before last quarter, RA and dec:  21 58 22, -15 57.4

The sun is down for  9.8 hr;  6.9 hr from eve->morn 18 deg twilight.
 1.8 dark hours after end of twilight and before moonrise.