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Measuring Distances

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Measuring Distances

- Triangulation: Measure baseline and angles, can calculate distance

Parallax: Similar to triangulation, but look at apparent motion of object against distant background from two vantage points

Measuring Earth’sradius:

Done by Eratosthenes about 2300 years ago; noticed that when Sun was directly overhead in one city,it was at an angle in another.

Measuring that angle and the distance between the cities gives the radius.

Converting baselines and parallaxes into distances