His seven year old son died. Kepler wrote to a friend that this death was particularly hard because the child reminded him so much of himself at that age. Then his wife died. Emperor Rudolf, whose health was failing, was forced to abdicate in favor of his brother Matthias, who, like Rudolf, was a Catholic but (unlike Rudolf) did not believe in tolerance of Protestants... displayed 300 characters
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Kepler had to leave Prague. Before he departed he had his wife's body moved into the son's grave, and wrote a Latin epitaph for them. He and his remaining children moved to Linz (now in Austria).
Marriage and Wine Barrels
Johanne seemed to have married his first wife, Barbara, for love (though the marriage was arranged through a broker)... displayed next 300 characters
In 1609 he published Astronomia Nova, delineating his discoveries, which are now called Kepler's first two laws of planetary motion. And what is just as important about this work, "it is the first published account wherein a scientist documents how he has coped with the multitude of imperfect data to forge a theory of surpassing accuracy" (O...
The second law is: the line joining the planet nearer to the sun sweeps in equal areas in equal times. For an object along an elliptical orbit to sweep out the area at a uniform rate, the object moves faster when the radius vector is short and the object moves slower when the radius vector is long...
A Danish astronomer, Tycho Brahe carefully recorded the movements of the planets for many years. He heard an old Greek idea that the sun was in the center of the universe and started looking to see if this could be true...
Child Labor is very common, and can be factory work, mining, prostitution quarrying, agriculture, helping in the parents' business, having one's own small business (for example selling food), or doing odd jobs...
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