By using pages on this web site you agree to be a fine human being, to respect all sentient life and to not sue me.
After all, it's just a weather forecast. In particular I make no statements about the saftey of any site for which I provide a weather forecast. (Most of them I've never been to.) Not all clear sky chart locations are public or even physical observings sites. Check with the land owner, local astronomy clubs, or even local law enforcement for physical and safety concerns before attempting to visit sites listed cleardarksky.com.
Clear Sky Charts and all the data on clear dark sky are free to use for everyone through web browsers. But authors of mobile device apps must write me for permission before using my data.
All clear sky charts belong to me, Attilla Danko, even if I use casual phrases like "your chart". They're mine. Mine I say! ...all MINE!..BWA HA HA HA......Ahem..
I reserve the right to delete charts that I believe have fallen into disuse. For the moment, that means charts whose legend pages haven't been downloaded in 30 days.
If you sponsor the clear sky charts, I will hold you in highest esteem and thank you by listing you on my webpages for some length of time, but no contract is formed for service.
Websites which do not charge admission may link any page at cleardarksky.com. (Websites which do charge admission can do what they like if they first buy me a 100 acre plot under a mag 7.4 sky.)
Websites which don't charge admission, and also don't make revnue from advertising, may display chart images, or preview images, provided each image links my legend page for that chart. Use the sample html that I have provided at the bottom of each chart's legend page. (Again, tedious rules like these may be discarded in exchange for sufficent largesse.)
Do not copy text, source-html or scripts from any page unless you get written permission from me. (Mostly because it just wont work off off my webhost.)
All pages on cleardarksky.com plus all clear sky chart images and preview images, no matter what website they appear on, are Copyright © 2002 - 2014 Attilla Danko.
Any transparency, cloud or seeing forecast map, labeled "CMC" is provided by the Canadian Meteorological Center and is © Crown copyright, product of Environment Canada. Seek their permission to display any of their maps, even if the maps are sourced from cleardarksky.com
All light pollution maps are from the Light Pollution Atlas 2006 by David Lorenz. David recalculated the The World Atlas of the Artificial Night Sky Brightness with newer data. Contact David to re-publish his maps even if you get them from cleardarksky.com.
If you email me, I will only email you with regard to this web site or possibly personal correspondance.
I do not email sponsors to bug them for ever increasing amounts of money (unless they ask in advance).
If you post an observation to the Astronomical Seeing Observation database, cleardarsky.com will not display your email address on any web page.
I may copy you on an email to a third person if that person is asking for changes to a chart that you requested.
Chart requesters of observatories who do not want their site made quite so public, for security reasons, may ask me for location privacy. I will then do my best to make sure their latitude and longitude does not appear on cleardarksky.com. I also wont show distances to private charts as any less than 24km (15mi). I will turn off the road map, satellite prediction, and other nifty, but potentially location-revealing, links on the chart's legend page. I will also turn off the "on click" navigation features of the light pollution and forecast maps linked to the chart's legend page.
I put google ads on some of my pages. But I prefer sponsorship. Sponsors are wonderful people. But there just aren't enough of them. So I put google ads on clear sky chart pages -- but only clear sky chart pages that are not sponsored.