Christopher James Baddiley

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  • in reply to: Dark Skies and Satellites in the News #619651

    Hello again, and thank you for your encouraging replies. Here is another piece of work that I did, concerning atmospheric scattering and ground reflection for consideration of new lighting developments. Another PowerPoint presentation. I hope you find it interesting.

    in reply to: Dark Skies and Satellites in the News #619638

    Hello, I am on the CfDS Committee and I have been encouraged by Howard to contribute to this forum. I have been doing my own research on light pollution of the rural area of the Malvern Hills AONB for many years.
    I attached a PDF that summarises my recent presentations at conferences and publications of this work complete with conclusions. Also, another of many satellite constellation trails across my DarkSky imaging as an example of what we are now facing.

    I have continuous one minute interval readings from my mast mounted networked SQL for six years, also all sky camera images at the same rate on the clearest of nights. Clear dark sky brightness continues to darken through midnight and beyond, by up to 0.3 magnitudes per square arc second. My sky brightness on good clear nights is 21.1. Gradual sky darkening during the night is always the case and is so across Europe. In general I do not do deep sky imaging until after midnight, for this reason. A combination of temperature drop towards dew point during the night with increasing mist on the horizon, blocking out distant city lighting and blocking horizon cloud reflection of city lighting beyond the horizon which causes most rural light pollution; also gradual turning off of lights after midnight, even if none local.

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