*** 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: Tue, 2000 May 16 ---> Wed, 2000 May 17
Local midnight = 2000 May 16, 23 hr UT, or JD 2451681.458
Local Mean Sidereal Time at midnight =  13 28 19.3

Sunset ( 2326 m horizon):   21 04 GDT; Sunrise:    7 12 GDT
Evening twilight:   22 26 GDT;  LMST at evening twilight:   11 54
Morning twilight:    5 50 GDT;  LMST at morning twilight:   19 19
12-degr twilight:  21 53 GDT -->   6 22 GDT; night center:    2 08 GDT

Moonrise:   19 18 GDT   
Moon at civil midnight: illuminated fraction 0.981
1.4 days until full moon, RA and dec:  14 41 02, -10 59.9

The sun is down for 10.1 hr;  7.4 hr from eve->morn 18 deg twilight.
Bright all night (moon up from evening to morning twilight).