*** 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 
2001 Mar 11 and after 2 AM 2001 Oct 14; standard zone =   4 hrs W

For the night of: Sun, 2001 Apr 15 ---> Mon, 2001 Apr 16
Local midnight = 2001 Apr 16,  4 hr UT, or JD 2452015.667
Local Mean Sidereal Time at midnight =  12 54 34.2

Sunset ( 2347 m horizon):   18 31 CST; Sunrise:    6 55 CST
Evening twilight:   19 43 CST;  LMST at evening twilight:    8 37
Morning twilight:    5 43 CST;  LMST at morning twilight:   18 38
12-degr twilight:  19 16 CST -->   6 10 CST; night center:    0 43 CST

Moonrise:    0 26 CST   
Moon at civil midnight: illuminated fraction 0.444
0.5 days after last quarter, RA and dec:  20 21 35, -21 07.0

The sun is down for 12.4 hr; 10.0 hr from eve->morn 18 deg twilight.
 4.7 dark hours after end of twilight and before moonrise.