Page 188 - 89 history of astronomy_opt
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who was working as his assistant, and al-
though there were disagreements between
them, Kepler held to his post, sustained by
the conviction that, with these observations
to test any theory, he would be in a posi-
tion to settle for ever the problem of the
solar system.
[Illustration: PORTRAIT OF JOHANNES
KEPLER. By F. Wanderer, from Reitlinger’s
188
