*** 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
2002 Mar 31 to 2 AM on 2002 Sep 29; standard zone =   0 hrs W

For the night of: Mon, 2002 Jun 17 ---> Tue, 2002 Jun 18
Local midnight = 2002 Jun 17, 23 hr UT, or JD 2452443.458
Local Mean Sidereal Time at midnight =  15 32 34.5

Sunset ( 2326 m horizon):   21 20 GDT; Sunrise:    7 05 GDT
Evening twilight:   22 46 GDT;  LMST at evening twilight:   14 19
Morning twilight:    5 39 GDT;  LMST at morning twilight:   21 12
12-degr twilight:  22 11 GDT -->   6 14 GDT; night center:    2 12 GDT

Moonset :    2 44 GDT   
Moon at civil midnight: illuminated fraction 0.489
0.1 days before first quarter, RA and dec:  11 49 50,   6 04.0

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