*** 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: Sat, 2000 Dec 16 ---> Sun, 2000 Dec 17
Local midnight = 2000 Dec 17,  3 hr UT, or JD 2451895.625
Local Mean Sidereal Time at midnight =   4 01 17.7

Sunset ( 2347 m horizon):   20 47 CDT; Sunrise:    6 31 CDT
Evening twilight:   22 15 CDT;  LMST at evening twilight:    2 16
Morning twilight:    5 04 CDT;  LMST at morning twilight:    9 06
12-degr twilight:  21 39 CDT -->   5 39 CDT; night center:    1 39 CDT

Moonrise:    1 26 CDT   
Moon at civil midnight: illuminated fraction 0.595
0.9 days before last quarter, RA and dec:  11 10 55,  10 53.9

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