Kepler determined the shape of each planet's orbit by triangulation from different points onEarth's orbit, using observations made at many different times of the year.

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Kepler did use triangulation from different points on Earth's orbit to determine the shape of each planet's orbit, using observations made at many different times of the year. Kepler used a combination of observations made over time and mathematical calculations to determine the shape of each planet's orbit. Triangulation was not involved.

Kepler Determined the Shape of Each Planet's Orbit by Triangulation