Illustration showing Kepler's laws of planetary motion. Kepler's three laws were published in 1609 (first and second laws) and 1619 (third law). The first law (top left) states that the orbit of each planet is an ellipse, with the Sun at one focus. Kepler's second law (top right) states that a line linking a planet to the Sun sweeps out an equal area in any given time. The third law states that the cube of the semi-major axis of a planet's orbit is directly proportional to the square of its orbital period. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Clarivan, Carlos |
Bildgröße: | 6200 px × 4800 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |