*** 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: Fri, 2000 Jun 16 ---> Sat, 2000 Jun 17
Local midnight = 2000 Jun 16, 23 hr UT, or JD 2451712.458
Local Mean Sidereal Time at midnight =  15 30 32.5

Sunset ( 2326 m horizon):   21 19 GDT; Sunrise:    7 05 GDT
Evening twilight:   22 46 GDT;  LMST at evening twilight:   14 16
Morning twilight:    5 39 GDT;  LMST at morning twilight:   21 10
12-degr twilight:  22 11 GDT -->   6 14 GDT; night center:    2 12 GDT

Moonrise:   20 48 GDT   
Moon at civil midnight: illuminated fraction 1.000
0.0 days after full moon, RA and dec:  17 46 10, -21 32.5

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).