Big Sky Observatory (BSO)
Our Dark Sky Site
The Bortle Scale is a 9-level numeric scale that measures the brightness of the night sky at a particular location.
The Big Sky Observatory is located adjacent to the Twin Valley Dam and next to the Twin Valley Campground. You will find the observatory on Highway 529, midway between Highway 2 and Highway 23. The interactive Google Map, located below, will help you determine the exact location of the Big Sky Observatory. You can zoom in and zoom out on this map, as well as scroll around.
The GPS coordinates of the observatory are 50° 13' 48" (50.23°) North and 113° 24' 00" (113.40°) West.
Big Sky Observatory on TV
From time to time, reporters from Calgary venture on out to the Big Sky Observatory to take in the action. We were recently featured on Global National News (video to be posted soon) and have appeared on City TV as well.
Big Sky Observatory Weather Report
Big Sky Observatory Clear Sky Chart
The chart below is a special weather forecast for the Big Sky Observatory. It shows, at a glance, if the sky will be cloudy or clear over the next two days. Therefore, it allows visitors to the observatory to know in advance if the weather will be good for astronomical observing. The Clear Sky Chart is constantly being updated and you can get more information by clicking on the chart.
Big Sky Observatory Astronomical Seeing Chart