Earth Hour Part II - the Condo can be found here.
In this third part I will table the measurements made with Unihedron Sky Quality Meter
It is not a toy although so easy to use that even an astronomer can use it:
Circalunar variations of the night sky brightness -- an FFT perspective on the impact of light pollution
or
Circalunar variations of the night sky brightness/impact of light pollution
or
Night sky photometry and spectroscopy performed at the Vienna University Observatory Johannes Puschnig, Thomas Posch, Stefan Uttenthaler
- OK, so maybe more than 1 astronomer wants to play! Actually, this is an invention, I believe, by Canadian astronomer, Doug Welch, at McMaster University, Hamilton, Ontario.
The following was written last Saturday:
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Notes from Earth Hour, Sat Mar 28, 2020 between 20:30 and 21:30 Eastern Daylight Time.
I used a "Sky Quality Meter" to measure quantitatively the brightness of the sky
in 2 directions, sequentially, straight up or Zenith, and toward the North Celestial
Pole about which the sky appears to turn, approx 45° elevation for Orillia.
The sky was 8/8 cloudy between 20:00 and 22:00 but may have varied in altitude - I just
don't know. The readings are in magnitudes per square arc second, useful in astronomy.
Essentially bigger numbers are from darker sky.
Time Zenith North Celestial Pole
20:06 12.46 still in twilight
20:14 14.22
20:32 16.69 16.71 Earth Hour start
21:00 16.71 16.96
21:15 17.66 17.07
21:35 16.92 17.09 end of Earth Hour
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Vicki and I intend to use this meter in our various outreach programs from monitoring bats and Whip-poor-wills to the night sky brightness during observations of the stars.
WOB
