Evidence & Experiment Two-Horizon Viewing

Take a look at the horizon of a great expanse of level land or sea. See if it looks flat, curved upwards or curved downwards. Use a long straight-edge held or balanced on something steady to assist your eyes. Here are some photographs in case you do not have such a big view within convenient distance from you.

/Driving/

Copyright:http://www.flickr.com/photos/morealtitude/731081486/

kokocrater.hike
Copyright: http://www-atdp.berkeley.edu/1522/students/angel/kokocrater.hike/koko4.jpg

Beach

Copyright: http://www.trustedreviews.com/images/article/inline/3742-Olympus_E- 400_distort.jpg

You might find other photos that are even better examples with some searching of your own.

Record your observations in a log book of some sort. Make them clear enough that someone, your grandchildren for example, will understand exactly what you saw, measured, and wondered about when they read your logbook in the distant future.

 

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