Clear Sky Chart

Astronomy-Weather Map
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ColorMeaning
Transparent
Above average
Average
Below Average
Poor
Too cloudy to forecast
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Map provided by the Canadian Meteorological Center and is © Crown copyright, product of Environment Canada.
Cursor shows location of the BRAC Ivy Hill Site Clear Sky Chart.
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Previous ForecastTime
11h UT
Cloud Cover
Transparency
Seeing
Wind
Humidity
Temperature
This Forecast Time
12h UT
Cloud Cover
Transparency
Seeing
Wind
Humidity
Temperature
Use these maps to check if you are observing at a place where the forecast changes slowly with distance -- that's where clear sky chart accuracy is best.

The observation of fine detail seen in telescopes on planets or the moon requires good seeing. Visiblity of galaxies nebulae in telescopes, or the milky way with the un-aided eye, requires good transparency. All astronomical observations require low cloud cover.

Humidity, Wind, and Temperature won't determine if you can observe, but they might affect how comfortable you are.

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