*** 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 Jul 25 ---> Wed, 2000 Jul 26
Local midnight = 2000 Jul 25, 23 hr UT, or JD 2451751.458
Local Mean Sidereal Time at midnight =  18 04 18.2

Sunset ( 2326 m horizon):   21 15 GDT; Sunrise:    7 22 GDT
Evening twilight:   22 36 GDT;  LMST at evening twilight:   16 40
Morning twilight:    6 00 GDT;  LMST at morning twilight:    0 05
12-degr twilight:  22 04 GDT -->   6 33 GDT; night center:    2 18 GDT

Moonrise:    2 48 GDT   
Moon at civil midnight: illuminated fraction 0.334
1.5 days after last quarter, RA and dec:   3 26 59,  13 13.1

The sun is down for 10.1 hr;  7.4 hr from eve->morn 18 deg twilight.
 4.2 dark hours after end of twilight and before moonrise.