Inge lehmann cause of death
Who discovered the layers of the earth.
Olaus Roemer Biography
Olaus Roemer was born in Jutland on September 25, 1644. He studied astronomy at the University of Copenhagen and traveled to Paris where he found his calling in observing the motions of Jupiter's largest satellites.
Gian Dominico Cassini, a colleague of Roemer's, had made very accurate observations of the orbits, and it was possible to predict precisely when a moon would be eclipsed as it passed behind Jupiter.
Roemer discovered, to his surprise, that the predicted times did not agree with observations.
Who discovered the outer core
When the Earth came around the Sun and was approaching Jupiter, the eclipses happened earlier than predicted. When the Earth was moving away from Jupiter, the eclipses occurred later. Roemer assumed the disparity was caused by the different distances light had to travel to get from Jupiter to the Earth.
But how to determine that speed?
As great a personage as Galileo had tried and failed, but the scale he used was too small. He tried to measure the speed of
