Three fundamental laws describing planetary motion: orbits are ellipses with the sun at one focus, planets sweep equal areas in equal times, and the square of orbital period is proportional to the cube of semi-major axis. These laws govern all orbital motion in the universe.
Formulated by German astronomer Johannes Kepler between 1609-1619 based on meticulous observations by Tycho Brahe. Kepler's work replaced circular orbits with elliptical ones and provided the mathematical foundation later explained by Newton's law of gravitation.
Kepler's laws revealed that planets don't march in perfect circles like clockwork - they dance in ellipses with constantly changing speeds! When planets are closer to the Sun, they speed up like a figure skater pulling in their arms, and this elegant choreography governs everything from comets to galaxies.
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