On 2003-05-31 an annular eclipse was highly partial observable in Germany, with its first contact long before sunrise and maximum eclipsed sun rising above the horizon. Of high interest was to record the progress of dawn, which was affected by the eclipse even before sunrise. I made dawn brightness measurements in Haltern am See, Germany (51.75° N, 7.18° E) and in Stuhr (53.02° N, 8.78° E) near Bremen, Germany. Times are MESZ (Middle European Summertime Zone, = UT +2h)
|sunrise of partial eclipsed sun in Stuhr near Bremen,
left: telelens 1:8/500
right and bottom:
upper right: 05:16 MESZ,
lower right: 05:18 MESZ,
below maximum eclipse,
The progress of dawn during the eclipse
The brightness sensor was the chip TSL 230 by Texas instruments. Precision of measurement set was +- 20%.
For temperature measurement I used in Stuhr the Thermosensor DS 1621, mounted on a 4 m high mast (picture on the right). In Haltern am See the sensor was the analog KTY 87-105 on a building's roof.
All measurement I made are available as a ZIP file.
Abb. 2: Graph of sky brightness in Haltern am See.
The solid yellow graph shows the brightness on eclipse day, the dashed line the brightness on 05-29, two days before. The fine red line is the quotient of both values (05-31 / 05-29). from 06:20 MESZ clouds diminished the brightness around 60% normal brightness.
Abb. 3: brightness in Stuhr near Bremen/Germany.
The solid yellow graph shows the brightness on eclipse day in
dashed line the brightness on 05-29, two days before from
Haltern am See for comparison.
The red line shows the temperature. Here also clouds affected
after 05:30 MESZ.
Vertical lines mark first contact, sunrise, maximum eclipse and sunset.
Maximum in Stuhr/Germany was at 5:31 MESZ; 1st contact at 4:36,
and 4th contact
at 6:30 MESZ.
© Dr. Wolfgang Strickling, Drususstr. 15, 45721 Haltern am See. Tel: +49 / 23 64 / 16 76 91
back to my German Homepage
table sofi2003mess.zip, ZIP compressed (decompressed: CSV-files)
My eclipse projects
My eclipse observations 1999, 2001, 2005 (in German, DE), 2006, 2008, 2009, 2011 (DE), 2012 (DE), 2015 (DE), 2016, 2017
last update was on 2017-09-13
URL is http://www.strickling.net/sofi2003_eng.htm