Astronomer Johannes Kepler, (December 27 1571, was born to a poor mercenary in Württemberg, Germany, who tracked the orbital path of Mars and published his three famous laws of planetary motion — which validated Copernicus’s theory of a sun-centered solar system — and later helped Isaac Newton discover the law of gravity.
Kepler was nearly blind from a smallpox epidemic when he was three, and he developed the first eyeglass designs for nearsightedness and farsightedness.
He was also the first to explain that
Johannes Kepler determined just how the planets of our solar system make their way around the sun. He published his innovative work on the subject from 1609 to 1619, and in the final year of that decade he also came up with a theory that each planet sings a song, and each in a different voice …
December 27th – It’s the birthday of astronomer Johannes Kepler, born to a poor mercenary in Württemberg, Germany (1571), who tracked the orbital path of Mars and published his three famous laws of planetary motion — which validated Copernicus’s theory of a sun-centered solar system — and later helped Isaac Newton discover the law of gravity. …
Nature, which is never not lavish of herself, after a lying-in of two thousand years, has finally brought you forth in these last generations, the first true images of the universe. By means of your concords of various voices, and through your ears, she has whispered to the human mind, the favorite daughter of God …
Johannes Kepler (December 27, 1571 – November 15, 1630) was a German mathematician, astronomer, and astrologer. A key figure in the 17th century scientific revolution, he is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the foundations for Isaac Newton’s theory of universal gravitation. During his career, Kepler was …
The Laws of Planetary Motion I. The orbits of the planets are ellipses, with the Sun at one focus of the ellipse. II. The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse. III. The ratio of the squares of the revolutionary …
How fast does the Earth go at perihelion and aphelion? The formula for the velocity of an object at some distance r from the Sun is: v = sqrt[GM*(2/r – 1/a)] Where G is the universal gravitational constant, M is the mass of the Sun, and a is the planet’s semimajor axis. At perihelion, …
How fast does the Earth go at perihelion and aphelion? Read More »
Earth at Perihelion On January 4, 2001, our planet made its annual closest approach to the Sun.Listen to this story (requires RealPlayer) January 4, 2001 — This morning at 5 o’clock Eastern Standard time (0900 UT) Earth made its annual closest approach to the Sun — an event astronomers call perihelion. Northerners shouldn’t expect any relief from the …
Kepler’s Law Question: According to Kepler’s law the Earth is closer to the sun in the summer winter than in the summer. If this is true would not it be warmer in the winter than in the summer? Answer: The reason for summer and winter is not because of the distance from the earth to …
Kepler’s Law Question: According to Kepler’s law the Earth is closer to the sun in the summer winter than in the summer. If this is true would not it be warmer in the winter than in the summer? ———————————————— Answer: The reason for summer and winter is not because of the distance from the earth …