Remember that old saying, "Once in a blue moon?" It's a phrase that is meant to describe something that rarely ever happens. However, astronomically speaking, a "blue moon" occurs every 1-3 years with the next one to occur Saturday evening near sunset. Now, the disclaimer is that the moon doesn't actually appear to be blue. Rather, it's a term used to describe either the second full moon in any given month, or the third full moon of four in any given season. Which definition you go by is up to you as they are both utilized. This particular "blue moon" event will be the third of four full moons of spring 2016.
The idea and naming process of the "blue moon" goes way back in history, and has been discussed numerous times. An agreement has never been solidified, which is why we have two definitions to this day. This particular "blue moon" event will be extra special because a reddish colored Mars will be very visible near the moon Saturday night, providing a special viewing.
Now the question of, "Will we be able to see this phenomenon?" needs to be answered.
The answer for northern Illinois and southern Wisconsin is a big YES. High pressure will be in control this weekend across the region, which will keep our skies mostly clear, if not completely clear on both Saturday and Sunday. Thus, if you want to experience a "blue moon" and see a reddish colored Mars, you are in luck. For the best views, it is suggested that you drive a few miles away from any city light pollution. The next "blue moon" won't occur until January 31st of 2018, and that will be a twice monthly event, not a seasonal event like Saturday's.
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