Tag Archives: International Dark-Sky Association

International Dark Sky Week April 19-26

International Dark Sky Week is coming around at just the right time. The weeklong (April 19-26) celebration of the night is supported by the International Dark-Sky Association (IDA). It is an opportunity for us all to consider the role of the night and its star-filled sky in each of our lives. This year, IDA is encouraging people around the world to come together online to celebrate the night and engage with authors, creators, scientists, and educators whose works have been vital to the movement to protect the night from light pollution.

“Right now, families around the globe find themselves spending many hours at home together,” notes Ruskin Hartley, IDA’s executive director. “It’s a perfect time to reconnect with the night sky — and International Dark-Sky Week provides a portal for that experience.”

The week includes online presentations by a couple of authors that we have featured in the past on Seattle Astronomy. Paul Bogard wrote one of our favorite books, The End of Night: Searching for Natural Darkness in an Age of Artificial Light (Little, Brown and Company, 2013). Bogard will do a reading from the book Tuesday, April 21. Tyler Nordgren, a professor of physics and an artist, will do a talk about the role of art in conversation on Monday, April 20. Nordgren has created a series of great solar system travel posters and is the author of Sun Moon Earth: The History of Solar Eclipses from Omens of Doom to Einstein and Exoplanets (Basic Books, 2016). Jeffrey Bennett, author of What Is Relativity?: An Intuitive Introduction to Einstein’s Ideas, and Why They Matter (Columbia University Press, 2014), will give a presentation called “I, Humanity” on Sunday, April 19. It is geared toward kids in grades five through seven.

There will be numerous other presentations about various astronomical topics. You can access the full schedule online, but beware that it isn’t particularly user friendly, and specific times for most of the presentations have not yet been set as of this writing.

Further reading:


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Pushing for IDA membership

Kelly Beatty thinks more amateur astronomers should be members of the International Dark-Sky Association (IDA), and he puts his money where his mouth is on the issue. Beatty, a senior editor of Sky & Telescope magazine and a board member of the IDA, made an offer to waive his usual fee for speaking at the recent Seattle Astronomical Society banquet if the group could sign up at least ten new or renewing IDA members. At last word they’d added at least a couple of dozen.

IDA logoStill, Beatty noted at the January 28 banquet that while there are roughly a quarter of a million amateur astronomers in the United States, the IDA has only about 3,000 members.

“That means that roughly one in a hundred amateur astronomers across the U.S. are members of IDA,” Beatty pointed out. “Isn’t that pathetic?”

“What other group has more to gain or lose from the success of the IDA and our dark sky preservation efforts?” he asked.



Beatty noted that LED street lighting is a major issue, and one on which regular citizens can help. If your city or town hasn’t converted street lights to LED yet, it probably will soon. LED street lights can be cheaper in a couple of ways. They consume less energy than typical street lights (though this paradoxically can cause a municipality to just buy more light), and the fixtures have a longer expected life span. What is important is that cities use fixtures that are at a color temperature of 3,000 kelvins or less. This provides warmer light with less blue in the spectrum. Blue light brightens the night sky more than any other color of light, and exposure to blue light at night has also been shown to harm human health and endanger wildlife.

Beatty said that the city of Phoenix recently decided to install 2,700-kelvin streetlights, Montreal dropped plans to install lights at 4,000 kelvins, and the entire state of Georgia is going with 3,000-kelvin lights.

“You have the power to make a difference in this fight against light pollution, individually and collectively,” Beatty said. “It’s not that people are opposed to doing the right thing, they just don’t know. It’s an education. So if you inject yourself into the process you can and will make a difference.”

IDA’s page about outdoor lighting basics and its LED practical guide have lots of useful information. Oh, and you can sign-up online. There’s a $15 annual membership for students, and standard memberships start at just $35.

MLO intro in Seattle

A promising new weapon against light pollution will receive a formal introduction at an event in Seattle Wednesday. Nancy Clanton, a board member of the International Dark-Sky Association (IDA) and member of the Illuminating Engineering Society of North America (IES), will present a workshop about the Model Lighting Ordinance (MLO) at 10 a.m. October 26 at the Lighting Design Lab, located at 2915 Fourth Avenue South in Seattle.

Lighting Design Lab

A workshop on the IDA/IES Model Lighting Ordinance will be held Oct. 26 at the Lighting Design Lab in Seattle.

A task force of the IDA and the IES spent seven years hammering out the details of the model lighting ordinance. It is intended as a guide for environmentally responsible outdoor lighting, and was designed to help municipalities develop outdoor lighting standards that reduce glare, light trespass, and skyglow.

Clanton, who co-chaired the task force, says the process took so long in part because the two organizations started with different sets of goals.

“It wasn’t even a compromise,” she said of the final version of the MLO approved this summer. “We actually blended the goals together and got a really good ordinance that addresses everyone’s concerns.”

The stars aligned to bring this rollout of the MLO to Seattle, according to Scott Kardel, public affairs director for the IDA.

“We’ve chosen Seattle to be the first site partly because Seattle and the Pacific Northwest is a progressive, happening area where people are interested in things like energy conservation,” Kardel said. “Also we have a very active chapter of the IDA, Dark Skies Northwest. It’s a good combination of being able to have our local chapter involved in promoting the event but in an area where we think it has a good chance to have good reception.”

Clanton said the four-hour workshop will give participants a lot of good information about the MLO.

“Here’s what it is, here’s how it was developed, and let us show you some examples of how it could be applied,” was her quick outline of the agenda. “It’s going to be an introduction, answering questions about the different parts of the MLO, and an encouragement for people to bring it to their cities and communities and start looking at adoption.” She noted that the workshop would be useful for city planners as well as for interested advocates who want to learn how to bring better lighting ordinances to their communities.

Clanton said that the city of Plymouth, Minnesota adopted an early version of the Model Lighting Ordinance, which was a big help as they worked through the process. Now Anchorage may be about ready to go to work on adopting the version approved this summer. Both she and Kardel noted that often cities will plow ahead on their own with lighting ordinances, using information from the IDA website, but not telling anyone or availing themselves of the association’s technical expertise. Clanton added that the MLO is not a product that’s ready to adopt off the shelf, but more of a template.

“The model lighting ordinance is supposed to be the technical part of a standard lighting ordinance,” she said, adding that they’ve included placeholder language for intent and the like, but that each community should customize the MLO based on its particular needs. “We had to write this ordinance as if it were a small village or New York City.”

Sky glow is a big deal in Tucson, with Kitt Peak, Mount Lemmon, and Mount Graham observatories in the neighborhood. Kardel said that Tucson, also home base to the IDA, is a prime example for us that lighting ordinances work to curb light pollution.

“We’ve had a big increase in population over the last several decades but have been able to hold on to the level of sky brightness, even with more people and more houses and more lights in the area,” Kardel said. “A good ordinance can do a good job to either hold on to what you have or make things better.”

Clanton gave a shout-out to amateur astronomers for their diligence on these issues.

“The astronomy community has been such a wonderful, vocal voice on light pollution,” she noted. “Without them, I don’t think a lot would have been established. They have been the grass roots in all kinds of light pollution ordinances.”

Cost to attend the workshop is $75 and includes lunch. Sign up here or visit the IDA website for more information.

Seattle Astronomy gets shout out from IDA

International Dark-Sky Association

Local dark-sky efforts and Seattle Astronomy are getting some notice among a wider audience. Dark Skies Northwest, the local chapter of the International Dark-Sky Association, has been particularly active over the last several years. Seattle Astronomy recognized the work of the locals, giving them two of our top 10 astronomy stories of 2010 (as reported through our former gig as Seattle Astronomy Examiner.) This detail was mentioned in the March 25 issue of Night Watch, the IDA’s newsletter. You’ll find the article about halfway through the newsletter. Scroll down to “chapter and volunteer updates” and find the article “Successes in the Fight Against Light Pollution in the Pacific Northwest.”

Props to David Ingram, Bruce Weertman, and all of the others involved with the work of Dark Skies Northwest. The group’s mission is to be a focal point for light pollution issues in the Northwest, to promote quality outdoor lighting, to promote and preserve the beautiful night sky, and to educate the public about the problem of light pollution and its solutions. DSNWs members include astronomers, naturalists, outdoor lighting engineers, and people who are generally concerned with the beauty their community.