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Kepler's formula- r1^3 / r2^3 = t1^2 / t2^2 may be written also r1^3 / t1^2 = r2^3 / t2^2 and this again in the generalized form: r3 / t2 = c. Obviously, by each of these steps we diminish the reality-value of the formula. In its original form, we find spatial extension compared with spatial extension, and temporal extension with temporal extension.
In the light of our previous studies we shall not find it difficult to test the reality-value of the thermodynamic conception of heat. As we know of mass through a definite sense-perception, so we know of heat. In the latter case we rely on the sense of warmth. Still, one-eyed, colour-blind observation is naturally unable to take account of these sense-messages.
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