Lunar eclipse Feb 20/21, 2008

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[DIR]small/2008-06-02 23:01 -  
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[IMG]Tautenburg_1024.png2008-02-22 09:58 84Kunder overcast skies
[TXT]ecl_en.htm2008-02-22 09:36 7.9KHow to do photometry
[TXT]ecl_cz.htm2008-02-20 17:52 7.5KHow to observe, Czech
[   ]brno.map.pdf2008-02-20 17:39 9.2KMoon due to parallax
[   ]brno.map.eps2008-02-20 17:39 12KMoon due to parallax
[   ]lun100cz.pdf2008-02-20 15:13 173Kbright points of Moon
[   ]brno.ecl.pdf2008-02-19 19:21 6.6Ktheor. illu. in Brno
[   ]mishawaka.ecl.pdf2008-02-18 18:26 6.6Ktheor. illu. US site

A rather overcast night produced still some eclipse signal over Tautenburg Observatory (courtesy GŁnter Wuchterl, University of Jena).
(a 7k thumbnail of the graph). Analogous measurement (showing but a proxy for horizontal illuminance) (with almost clear sky up to 23 h, and heavily overcast since about 3:25) from Brno Observatory. An overview of light condition at this site since June 2006 is at http://amper.ped.muni.cz/weather. During this February eclipse, a typical situation of a heavily overcast sky is apparent in Brno: horizontal illuminance reaches 0.3 lx even without moonlight... unlike over Tautenburg with much less light pollution. Before the eclipse, the graph shows the moonlight exaggerated, this is because of the PV panel having no filter and being sensitive to the surplus of infrared radiation from the Moon, compared to the Sun (lunar reflectivity increases quite a lot through red to near infrared).