*** 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: Mon, 2001 Apr 9 ---> Tue, 2001 Apr 10
Local midnight = 2001 Apr 10,  4 hr UT, or JD 2452009.667
Local Mean Sidereal Time at midnight =  12 30 54.9

Sunset ( 2347 m horizon):   18 38 CST; Sunrise:    6 51 CST
Evening twilight:   19 49 CST;  LMST at evening twilight:    8 20
Morning twilight:    5 40 CST;  LMST at morning twilight:   18 11
12-degr twilight:  19 22 CST -->   6 07 CST; night center:    0 45 CST

Moonrise:   19 48 CST   
Moon at civil midnight: illuminated fraction 0.945
2.0 days after full moon, RA and dec:  15 03 52, -12 40.4

The sun is down for 12.2 hr;  9.8 hr from eve->morn 18 deg twilight.
Bright all night (moon up from evening to morning twilight).