Clear Sky Charts
Only non-private charts in Illinois shown: 99 of 4867 in North America.
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How to read this map
This map shows where astronomy-specific weather forecasts, or "clear sky charts", are available. The colors of the markers indicate amount of light pollution there (colors defined
). You can:
hover over a colored marker to show the chart's name
Click on a maker to display a the small version of the chart, and link to the full version
Click and drag on the map to pan.
Double click on the map to pan and zoom.
Even though this map can be zoomed out to show the all of North America, this page only shows charts in Illinois. The full list is
Clear Sky Chart