Earth Hour Part III - The measurements

Earth Hour intro + Part I can be found here

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