1. Measuring the night sky and light pollution
Pen-Yuan Hsing
Into the Night workshop
16 February 2017
modified from “Light Pollution" by Timothy Tsui from Flickr CC BY-SA 2.0

2. sky glow light trespass & glare
modified from “Light Pollution" by Timothy Tsui from Flickr CC BY-SA 2.0

3. sky glow & ambient light
sky quality meters (SQMs)
mobile apps
“eye test”
Snellen Eye Test Chart (modified) by GDJ from openclipart, public domain
handset (modified) by Clker Free Vector Images from pixabay, public domain

4. sky quality meters (SQMs)
DIY with Arduino

5. star field from Stellarium 0.15.1

6. star field from Stellarium 0.15.1

7. star field from Stellarium 0.15.1

8. screenshots of Globe at Night under fair use
star field from Stellarium

9. Loss of the Night
Globe at Night and Loss of the Night logos under fair use

10. screenshot of myskyatnight.com under fair use

11. screenshot of myskyatnight.com under fair use

12. sky quality meters (SQMs)
mobile apps
“eye test”
Snellen Eye Test Chart (modified) by GDJ from openclipart, public domain
handset (modified) by Clker Free Vector Images from pixabay, public domain

13. modified from "Vision of Eyechart with Glasses" by Ken Teegardin from Flickr CC BY-SA 2.0

14. Snellen Eye Test Chart (modified) by GDJ from openclipart, public domain
star field from Stellarium

15. face modified from “Awesome” by rones on openclipart, public domain
star field from Stellarium

16. How does this fit into…
Earth Hour?
glow worm surveys?

17. This presentation can be downloaded here (), shared under the Creative Commons Attribution-ShareAlike 4.0 International license unless otherwise noted in the slides.