*** 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: Thu, 2001 Apr 12 ---> Fri, 2001 Apr 13
Local midnight = 2001 Apr 13,  4 hr UT, or JD 2452012.667
Local Mean Sidereal Time at midnight =  12 42 44.5

Sunset ( 2347 m horizon):   18 34 CST; Sunrise:    6 53 CST
Evening twilight:   19 46 CST;  LMST at evening twilight:    8 28
Morning twilight:    5 41 CST;  LMST at morning twilight:   18 25
12-degr twilight:  19 19 CST -->   6 09 CST; night center:    0 44 CST

Moonrise:   21 55 CST   
Moon at civil midnight: illuminated fraction 0.726
2.5 days before last quarter, RA and dec:  17 44 49, -21 49.6

The sun is down for 12.3 hr;  9.9 hr from eve->morn 18 deg twilight.
 2.1 dark hours after end of twilight and before moonrise.