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 for any reason. So there. I do the best I can for users and sponsors but no contract is formed when you use my website or sponsor.
After all, it's just a weather forecast. In particular I make no statements about the safety 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.
If you miss an observing event, or the 2024 solar eclipse because of an error on cleardarksky.com in weather forecasting or eclipse times or locations, your redress is limited to my apology. Eclipse watchers should check their eclipse times with the United States Naval Observatory.
Watch the 2024 Solar Eclipse at your own risk. ClearDarkSky.com does not provide complete eclipse saftey information. Nasa's eye safety page is a start. No joke. You may suffer partial or complete blindness if you watch the eclipse improperly. Again, by using www.cleardarksky.com website, you agree not to sue me.
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!..BWAA HA HA HA........
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 used 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 revenue 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 - 2021 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 weather maps, even if the maps are sourced from cleardarksky.com
All light pollution maps are from the Light Pollution Atlas 2016 by David Lorenz. David recalculated the The World Atlas of the Artificial Night Sky Brightness with newer data. Contact David to re-publish his light pollution maps even if you get them from cleardarksky.com.
The ECMWF forecast on clear sky charts is from the Norwegian Meteorological Institute, also known as MET Norway.
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 me to remind them of expiring sponsorships). I might email sponsors once more about a previous sponsorship.
I may copy you on an email to a third person if that person is asking for changes to a chart that you requested.
But I've asked google to count page usage with Google Analytics which may set their own cookies. I use Google Analytics to figure out when to buy more computers, in what order to update charts (I update the sponsored and most-used ones first) and to identify charts that are no longer used. I also use Google AdSense, which may set their own cookies, to display ads. But I never display ads on sponsored clear sky chart pages.
You can set your browser to reject google's cookies, if you like. I consider your usage of cleardarksky.com as acceptance of such cookies otherwise.
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 prefer sponsorship. Sponsors are wonderful people. But there aren't enough of them. So I put ads on some pages on cleardarksky.com. I do not place ads on clear sky chart pages that are sponsored.
Ads that are streamed to my pages are from Google Adsense. Info about how Google uses data it collect from displed ads is here.