As Far As the Eye Can See (Hint: It’s Not Far) – Flatland (blog)

As it happens, the stars have aligned between curiousKC and the historic astronomical event coming Aug. 21.

Just as our region was preparing for the full lunar eclipse, Kansas Citian Clark Johnson wondered if there is any local regulation of light pollution. Johnson asked curiousKC: Is there an ordinance for reducing light pollution?

While light pollution can come from many sources, some natural, most are human-made. Kansas City, like most built-up cities, has a sky glow, city light reflected in the night sky. The glow from our artificial light blocks from view around 46 billion light years or the approximate size of the universe.

Use the slider above tocompare the night sky visibility between downtown Kansas City and Brookfield, Missouri, about 120 miles northeast. (Photos: Ryan Hennessy | Flatland)

What we found is that Kansas City does regulate outdoor lighting that can bother neighbors. Or, as the city code puts it, the intent is to protect the public health and general welfare by controlling the adverse impacts of glare and light trespass associated with poorly shielded or inappropriately directed lighting fixtures.

The code calls for partial shielding of light in some cases, and states unequivocally that glare must be avoided by reflecting outdoor lighting away from residences and streets.

Exemptions include temporary holiday light displays.

The strongest wording from Kansas Citys zoning and development codes on outdoor lighting says, All outdoor light sources that produce more than 4,050 lumens must be at least partially shielded.

However, that amount of lumens isnt much of a restriction. The average halogen car headlights are around 800 lumens at low beam and around 1300 lumens at high beam.

Most unshielded lights waste energy and contribute to light pollution. Dark-sky advocates, those who work to reduce light pollution, would argue an example of unnecessary light escaping upward can be found in the Riverfront Heritage Trail in Berkley Park near the River Market. The trail stretches 15 miles long, and is lit by old fashioned-styled lamps that have no top shield.

Seeing stars that arent dimmed by downtowns lights doesnt happen until you are more than 30 miles from the city center, and even then, you havent gone far enough to see them all. It takes double that distance to reach an area considered a dark night sky. We used this map to find a close dark spot to Kansas City.

As for the eclipse, Carolyn Adkins, City Streetlight Maintenance Supervisor, said Kansas Citys automatic lights are on photosensors, much like automatic headlights on a car, and would most likely be activated during the dark parts of the celestial event. She noted this would keep the streets safe for pedestrians and drivers.

Thanks, Clark Johnson, foryour brightquestion.Got a question about Kansas City, the region or the people who live here? Anything youve always wondered about, found peculiar or downright confusing? Share your questions with KCPTs curiousKC

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As Far As the Eye Can See (Hint: It's Not Far) - Flatland (blog)