Measuring distances
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Measuring Distances. The Measurement of Distance. Triangulation : Measure baseline and angles, can calculate distance. The Measurement of Distance. Parallax : Similar to triangulation, but look at apparent motion of object against distant background from two vantage points.

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The measurement of distance
The Measurement of Distance

  • Triangulation: Measure baseline and angles, can calculate distance


The measurement of distance1
The Measurement of 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.


Measuring distances with geometry
Measuring Distances with Geometry

Converting baselines and parallaxes into distances


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