*** 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 Jul 28 ---> Sat, 2000 Jul 29
Local midnight = 2000 Jul 28, 23 hr UT, or JD 2451754.458
Local Mean Sidereal Time at midnight =  18 16 07.8

Sunset ( 2326 m horizon):   21 13 GDT; Sunrise:    7 24 GDT
Evening twilight:   22 34 GDT;  LMST at evening twilight:   16 50
Morning twilight:    6 02 GDT;  LMST at morning twilight:    0 20
12-degr twilight:  22 02 GDT -->   6 35 GDT; night center:    2 18 GDT

Moonset :   18 53 GDT   Moonrise:    5 26 GDT   
Moon at civil midnight: illuminated fraction 0.068
2.1 days before new moon, RA and dec:   6 25 17,  20 50.2

The sun is down for 10.2 hr;  7.5 hr from eve->morn 18 deg twilight.
 6.9 dark hours after end of twilight and before moonrise.