Pa relax
I just popped out to take the dog for a quick walk and noticed a couple of people taking a photograph on the road outside our house. They were photographing the sun setting on the mountain on the other side of the fjord. As I walked up the mountain I noticed that, after not very far, I was back in the sun again. A good example of parallax, so I thought I'd try to do a rough calculation. The distance to the sun is 1.5 x1011 m and its diameter is 1.4 x 109 m (I don't remember this stuff I looked it up) so the angle subtended by the Sun at the Earth is about 0.01rad. The distance to the mountain looks about 1km so I would have to go up a distance of 10m to be able to see the sun again. Well I'm sure I went further than that so thought I'd have a look at the map. I copied an image from google maps into LoggerPro and measured the distance to the mountain and found that it is approximately 3km which means I must have been 30m up when I saw the whole sun, assuming I went fast enough to be able to ignore the rotation of the Earth in this time. This seems more reasonable.
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