Presentation on theme: "Bringing back the Night Sky: Lighting In Toronto Parks Peter Hiscocks, RASC 12 August 2010."— Presentation transcript:
Bringing back the Night Sky: Lighting In Toronto Parks Peter Hiscocks, RASC 12 August 2010
The Royal Astronomical Society of Canada (RASC) Mandate: to stimulate interest and increase knowledge in astronomy 29 Centres across Canada 4000 members, 700 in the Toronto Centre 2 Meetings per month, 2 sky observing sessions, activities at the David Dunlap Observatory
The Great Blackout, August 2003 Photo credit Todd Carlson, Goodwood ON
Defining Glare Glare: contrast lowering effect of stray light in a visual scene. Glare forms a veil of luminance which reduces the contrast and thus decreases the visibility of a target. We cannot see intensity differences efficiently in the presence of a high background of light intensity. The sensitivity to glare is amplified with age as scattering in cornea or lens increases.
Solution Full-cutoff fixture that directs light downward
Marie-Curtis Recommendations Replace 'Top-Hat' fixtures with full-cutoff Berm or foliage between parking lot and observing site Avoid Wall-Packs in building resdesigns
Overview and Summary Park lighting is a mix: some effective, some problematic Energy efficiency and light pollution can be reduced with modified or new fixtures With minor fixes, parks could become much more hospitable to public sky observing activities
The Payoff Hundreds of Torontonians get an introduction to the night sky. Parks and Rec credited for first 'Urban sky park' areas in North America. Aligns with Parks Canada, 12 dark sky preserves
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