Sorry if this is a repost but I found this information over at CloudyNights and felt it was interesting. Tom T who works for the National Park Service is putting up light domes for the national parks. Here is the first one over on Colorado that you can view in google earth: http://bbs.keyhole.com/ubb/ubbthreads.php?ubb=showthreaded&Number=1289032&#P... See his first attachment which is a KMZ file ( like being able to use this view in Google Earth to view interactively how the LP is in a national park, or how the NP is being impacted by LP). From this site http://www.nature.nps.gov/air/lightscapes/monitorData/index.cfm you can read about the project and few the older data for Arches, Canyonlands and Natural Bridges. Sorry, no Zion's in there yet. He states in this threadhttp://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/3515825/pag... that the team he is on is tasked with going to all of the national parks so I'm sure we'll see one for Zion's and I think it will be interesting. Here is the 2003 report from Arches: http://www.nature.nps.gov/air/lightscapes/monitorData/arch/aR20030603.cfm Canyonlands 2003 http://www.nature.nps.gov/air/lightscapes/monitorData/cany/gP20030602.cfm "one of the darkest sites yet visited" Natural Bridges 2003: http://www.nature.nps.gov/air/lightscapes/monitorData/nabr/lDI20030604.cfm "The ONLY Bortle class 2 sky seen to date" It will be nice to see this updated. I did leave a post to Tom on whether he would like input from the old timers here who have been using the parks since I was a teen in California and backpacking in the Sierra Nevada. I hope this is something the Park Service does like once every 10 years so perhaps we can preserve the dark skies in these treasured spots.