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What are some important dates in history in Romania?
Some important dates in Romanian history include the unification of Wallachia and Moldavia in 1859, resulting in the creation of modern Romania in 1862, the Great Union Day on December 1, 1918, when Transylvania, Bukovina, and Bessarabia joined Romania, and the fall of communism on December 25, 1989, marked by the execution of Nicolae Ceaușescu.
Why was it difficult for ancient astronomers to explain about the apparent retrograde motion?
Ancient astronomers found it difficult to explain apparent retrograde motion because they believed the Earth was at the center of the universe and all celestial bodies revolved around it in perfect circles. Retrograde motion conflicted with this geocentric model, leading to complex explanations involving epicycles and deferents. It wasn't until Copernicus proposed a heliocentric model that retrograde motion could be better understood as an illusion caused by the relative speeds and orbits of planets.
How did Kepler disagree with the theorys of Copernicus?
Johannes Kepler found out that planets move in ellipses and move at variable speeds as they travel round the sun. The former theory of Copernicus was not wrong, but Kepler's theory was found to be more accurate when accurate observational methods were developed. Later Kepler's theory was backed up by theory when Newton's law of gravitation came along. However in the 20th century Einstein's theory of relativity produced some small corrections to the Kepler/Newton theory.
When did the majority of people start to believe in a heliocentric galexy?
The heliocentric model of the galaxy, where the Sun is at the center, gained widespread acceptance in the 16th century after Copernicus proposed it in his book "On the Revolutions of the Celestial Spheres" in 1543. However, it took some time for this idea to be fully embraced by society and the scientific community.
