trigonometry

How big is the Earth’s shadow on the Moon?

Friday, December 16th, 2011

When I saw yesterday’s Astronomy Picture of the Day, I was fascinated by just how big the Earth’s shadow is on the Moon. When I made a comment to this effect on Facebook, my friend, Josh Grady, said, “It’d depend on the distance between the two, no?” Of course the size of a shadow depends [...]

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How fast do you need to drive in the rain to keep your rear window dry?

Wednesday, November 9th, 2011

Last week, we had quite the deluge, which coincided, unfortunately, with me having to drive 120 km. I noticed that whenever I slowed down, the rear window would get wet and hard to see out of. Once I sped up again, one wiper pass dried it off and it stayed dry until I slowed down [...]

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