Sorry Starry Night

Student experiment measures sky glow before and after development.

An individual conducted a science experiment that measured the impact of  on the sky above an adjacent neighborhood.  On five clear nights between March 2006 and December 2006, she measured the sky glow at seven sites using two Sky Quality Meters (SQMs).  The experiment spanned the time from when the 30-acre development was just an open field  to when it was partially developed and open for business, during which time there were significant increases in its outdoor lighting. 

 

 

At each of the seven sites she typically recorded ten readings with one SQM and five readings with a second SQM through the car's sunroof.  Overall she recorded 480 SQM readings and entered her results in a database.  Sometimes she copied a local Clear Sky Clock to confirm that the sky was without celestial interference (e.g., full moon) during her observations.  On December 14, by serendipity the student briefly witnessed the concurrent aurora  and Geminid meteor shower.

 

 

She tried to control as many variables as possible.  For example, she only went out after astronomical twilight, when the sun contributed no light to the sky glow; she went out when the moon was either absent or well below the SQM’s 80-degree cone of detection; and she was consistent with where and how she took her observations.

 

 

Later she drew graphs by hand  that showed the SQM reading numbers on the x-axis versus the SQM units on the y-axis.  She correlated the curves of the two meters on a graph to see if her meters were consistent with each other.  She also averaged her SQM readings and plotted a generally descending slope, which suggested an increase in the measured sky glow. 

 

 

While she concluded some of the increased sky glow from March to December was from the new shopping center adjacent to her neighborhood sites, she also attributed some of the increase to holiday lights.  After all, she noted, late November was exceptionally mild, so many more lights than normal seemed to affect the sky.  The student wrote that if she were to do it again she would increase the number of observation sites; take greater advantage of clear nights to get more readings; and increase the number of meters used at each site.

 

 

To convey the impact of excessive outdoor lighting, she named her project Sorry Starry Night.  For a visual impression, she displayed one picture of Vincent van Gogh’s original masterpiece  next to a second picture that she modified on a computer.  Her version of Starry Night  showed the new retail development on top of van Gogh’s village, and a yellow, light-polluted sky degraded his original blue swirls. Later she shared her findings with the local amateur astronomy community  and at the regional science fair.

 

 

The 2007 Sorry Starry Night experiment was a follow-up to two light pollution demonstrations  she created two years prior.  That activity, called Light Here, Light There, showed the positive outcomes from shielding outdoor lights

Original student webpage saved in PDF.

Site of Development

Site of Development

Land to be developed for Heritage Square and Toscana Park.

Before Development

Before Development

Site of Heritage Square before it's illuminated.

Developer Responds

Developer Responds

Developer Jerry Macri of Toscana Park and architect Larry Hupp responded to requests for better lighting. Toscana Park earned a design award from the International Dark-Sky Association.

SQM Reading Locations

SQM Reading Locations

Sites for SQM readings around Heritage Square and Toscana Park, for "Sorry Starry Night."

Star Roof

Star Roof

Taking SQM readings through sunroof.

Serendipitous Aurora

Serendipitous Aurora

Witnessed aurora after being serendipitously alerted when SQM meter readings spiked.

Uplighting

Uplighting

Developer for Martin's installed uplighting in sidewalk for wall wash.

SJC County Enacts Lighting Ordinance

SJC County Enacts Lighting Ordinance

St. Joseph County Council enacts a new lighting code.

Martin's at Night

Martin's at Night

Martin's lit up at night, which counters gains from shielded parking lot box lights.

Starry Night

Starry Night

Van Gogh's "Starry Night"--before development.

Sorry Night

Sorry Night

Depiction of Van Gogh's "Starry Night"--after development.

Shielded Lights at Work

Shielded Lights at Work

Shielded lights illuminate sidewalk well.

Sky Glow Data

Sky Glow Data

Average Sky Glow, March-December 2006.

Mishawaka Lighting Code

Mishawaka Lighting Code

Mishawaka lighting code, limited and not enforced.