*** Almanac for the currently specified date ***:
Almanac for ESO, Cerro La Silla:
long.   4 42 55 (h.m.s) W, lat. -29 15.4 (d.m), elev.  2347 m
Chilean Daylight Savings Time used before 2 AM 
2000 Mar 12 and after 2 AM 2000 Oct 8; standard zone =   4 hrs W

For the night of: Sun, 2000 Dec 17 ---> Mon, 2000 Dec 18
Local midnight = 2000 Dec 18,  3 hr UT, or JD 2451896.625
Local Mean Sidereal Time at midnight =   4 05 14.2

Sunset ( 2347 m horizon):   20 48 CDT; Sunrise:    6 31 CDT
Evening twilight:   22 15 CDT;  LMST at evening twilight:    2 20
Morning twilight:    5 04 CDT;  LMST at morning twilight:    9 10
12-degr twilight:  21 40 CDT -->   5 39 CDT; night center:    1 40 CDT

Moonrise:    2 03 CDT   
Moon at civil midnight: illuminated fraction 0.485
0.1 days after last quarter, RA and dec:  12 02 36,   5 56.0

The sun is down for  9.7 hr;  6.8 hr from eve->morn 18 deg twilight.
 3.8 dark hours after end of twilight and before moonrise.