*** 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: Sat, 2000 Jun 17 ---> Sun, 2000 Jun 18
Local midnight = 2000 Jun 17, 23 hr UT, or JD 2451713.458
Local Mean Sidereal Time at midnight =  15 34 29.1

Sunset ( 2326 m horizon):   21 20 GDT; Sunrise:    7 05 GDT
Evening twilight:   22 46 GDT;  LMST at evening twilight:   14 21
Morning twilight:    5 39 GDT;  LMST at morning twilight:   21 14
12-degr twilight:  22 11 GDT -->   6 14 GDT; night center:    2 13 GDT

Moonrise:   21 39 GDT   
Moon at civil midnight: illuminated fraction 0.990
1.0 days after full moon, RA and dec:  18 37 36, -22 18.4

The sun is down for  9.8 hr;  6.9 hr from eve->morn 18 deg twilight.
Bright all night (moon up from evening to morning twilight).