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Pastimes : Google Earth
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From: Stan4/6/2016 12:14:52 PM
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Kind of interesting. I enjoy watching airliners flying along making contrails out my back window. A lot of them flying out of the south end up almost directly overhead.

I got curious the other day about how far away they might be when I first spotted a contrail of one of those that end up here. Using an average of 560 mph, the longest ones take about 5 minutes and 45 seconds to reach me. That comes out to about 55 miles away. That's farther than I had guessed, which was about 30-35 miles away. I think I could see them a bit earlier if I concentrate on the horizon, but there is a low roof in the way. Without that, I think I could spot the trail over 60 miles away. But they are really faint at those distances.

Google Earth has a ruler in Tools that lets you measure distances from a starting point to an ending one. Turns out I start seeing them when they're over Salisbury Maryland from my place in the Cape May peninsula in New Jersey. Pretty cool to find that out if you ask me.
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