Clear Sky Chart

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Contents

Find a chart
News (April 5)
Meet the Perps
Coverage Map
Your own chart
Silly Files (Jan 5)
Boring Admin Stuff
 -Terms of Use
 -Copyright
 -Privacy
 -Advertising
Credits
How to Help
Contacts

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Related Sites

International Dark-Sky Association

RASC Light Pollution Abatement

Clear Sky Alarm Clock

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Asteroid (161693) Attilladanko

WOW Favorite Link Award

What is it?

It's is specifically intended for amateur astronomers. The data comes a forecast model developed by Allan Rahill of the Canadian Meteorological Center.

Read from left to right. Locate a column of blue blocks. That's when the sky will likely to be clear and dark. A more detailed explanation is here, but the short version is: the clear sky chart predicts hourly cloud cover, atmospheric transparency and seeing. (Good "seeing" occurs when the air is steady enough to allow you to see fine detail on planets through a telescope.) That means you can plan whether to observe galaxies or planets or stay home and process image data.

Are there Charts for other locations?

Yes, thousands. The coverage area is Canada, USA and parts of Mexico.

Search

Browse

Search Nearby: By Keyword Ex: "lick observatory" finds the Mount Hamilton chart. By Entered Position dd.dd: Lat: N Long: W Or dd°mm': Lat: N°' Long: W°' Display distance in: Kms Miles Coverage Map Clickable map Charts on OSM Maps All Charts By popular keyword Astronomy Clubs list map Astronomy Villages and Parks list map Campgrounds list map Dark-Sky Preserves list map Observatories list map Planetariums list map Museums list map Parks:    Provincial list map    State list map    National list map RASC Centres list map Star Parties list map Wildlife center/area list map Want a more powerful search, try: Web cleardarksky.com

Newest charts All 6200 charts: in one page (1044Kb) for those who like to grep. Canada Alberta(152) list map British Columbia(148) list map Manitoba(51) list map New Brunswick(41) list map Newfoundland(25) list map Northwest Territories(7) list map Nova Scotia(68) list map Nunavut(8) list map Ontario(430) list map Prince Edward Island(14) list map Quebec(311) list map Saskatchewan(42) list map Yukon(17) list map 1314 charts in Canada Mexico Baja California(7) list map Chihuahua(2) list map Sonora(7) list map 16 charts in Mexico Bahamas Cat Island(1) list map Grand Bahama(1) list map New Providence(1) list map 3 charts in Bahamas USA Alabama(58) list map Alaska(38) list map Arizona(175) list map Arkansas(51) list map California(470) list map Colorado(174) list map Connecticut(46) list map DC(3) list map Delaware(11) list map Florida(201) list map Georgia(107) list map Idaho(62) list map Illinois(120) list map Indiana(78) list map Iowa(44) list map Kansas(70) list map Kentucky(57) list map Louisiana(34) list map Maine(63) list map Maryland(58) list map Massachusetts(73) list map Michigan(159) list map Minnesota(82) list map Mississippi(37) list map Missouri(105) list map Montana(36) list map Nebraska(52) list map Nevada(57) list map New Hampshire(49) list map New Jersey(62) list map New Mexico(131) list map New York(191) list map North Carolina(129) list map North Dakota(13) list map Ohio(136) list map Oklahoma(63) list map Oregon(121) list map Pennsylvania(188) list map Rhode Island(17) list map South Carolina(106) list map South Dakota(40) list map Tennessee(89) list map Texas(395) list map Utah(91) list map Vermont(40) list map Virginia(148) list map Washington(140) list map West Virginia(41) list map Wisconsin(110) list map Wyoming(45) list map 4866 charts in USA

May I get my own Chart?

If you observe at a site more than 24km or 15 miles from an existing chart site, feel free to request a chart for it. You can find the closest chart site to a latitude/longitude here.

I can generate charts for almost anywhere in Canada and US. See the coverage map.

To ask for a CSC, email CSCCharts (Attilla Danko or a colleague) with:

• Latitude and longitude accurate to at least 0.001 degree in DD.DDD format. Also elevation, if you know it. Within 300m or 1000ft is good.

For towns, use heavens-above.com. For other sites, use Google Maps: zoom in on your site, then click on "link to this page" and email me the resulting url.
• Timezone and whether you use daylight savings time during summer.
• Province or State, so I can list it correctly in the directories.
• Name, or what you'd like to see in the title. Like "Starhill Observatory" or "Saskatoon". Please choose the name of a place. But star party names are good too.
• Whether the site is public or private, or has any affiliations with astronomy clubs or organizations.
• The name of the closest chart to your new location and the distance. You can find the closest chart site to a latitude/longitude here
• URL of a web page related to the site, if you have one. Club or observatory web pages, or web pages about public places at the location of the chart are welcome.
• Check the privacy policy and let me know if you'd like to keep confidential your site's precise location. If you request location confidentiality, you agree that your information will still be shared by all current and future site maintainers.

I reserve the right to offer you a different chart that is still close enough to give maximally accurate forecasts.

There is no cost. But you're welcome to sponsor.