LET us now consider some of the tests which we use in practice to measure distance and direction near the surface of the Earth, to substantiate the claim that they are secondary tests. In the examples I shall confine myself to cases of distance being measured from one material object A to another one B in the frame in which A is at rest, viz. the ‘proper distance’ from A to B.
KeywordsAbsolute Magnitude Euclidean Geometry Distant Object Primary Test Apparent Magnitude
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