*** 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: Tue, 2001 Apr 17 ---> Wed, 2001 Apr 18
Local midnight = 2001 Apr 18,  4 hr UT, or JD 2452017.667
Local Mean Sidereal Time at midnight =  13 02 27.3

Sunset ( 2347 m horizon):   18 29 CST; Sunrise:    6 56 CST
Evening twilight:   19 41 CST;  LMST at evening twilight:    8 43
Morning twilight:    5 44 CST;  LMST at morning twilight:   18 47
12-degr twilight:  19 14 CST -->   6 11 CST; night center:    0 43 CST

Moonrise:    2 13 CST   
Moon at civil midnight: illuminated fraction 0.265
2.5 days after last quarter, RA and dec:  21 58 43, -15 52.3

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