...its our currency so lets start with the paper:

Accepted just Thu its available online already today

doi.org/10.1016/j.jqsr…

Zoltán Kolláth identified Sölktäler Naturpark (village of Mößna) in Austria as one of the best dark sky sites in Europe

all-sky images below

1/x we trace the changes in the natural color spectrum of the night sky with spectral radiance measurements

Sölktal has a broad continuum and the natural lines but hardly any spectral features of LEDs or conventional lighting technology - which Zselic has

2/x

About a year ago we had the 1st #covidlockdown in Germany

I'm the stay-home homeschooling dad - my wife is a medical doctor

But I could work @ night which I do often anyway

I did measure the night sky brightness and found it had decreased compared to before lockdown (1/12)

https://twitter.com/AndreasJechow/status/1320724549344833537

so in March 2017 it was less bright than in 2020 (see figure for zenith brightness)

this is surprising because we would expect light emission and #lightpollution to increase like shown in the paper we co-authored with @skyglowberlin and others

advances.sciencemag.org/content/3/11/e…

(2/12)