Because plain circular orbits could not explain the way the planets move. The philosophers said that the circle was the perfect curve, and Ptolemy's model used circles and epicycles.
An epicycle is a small circle whose centre travels round a larger circle, and the planet then travels round the epicycle. Extra epicycles were added to account for things like the eccentric orbits (which are now recognised as elliptical), and the inclination of the orbits.
However Ptolemy's model represented the movements of the planets pretty accurately which is why no-one thought to challenge it for 1400 years. Ptolemy's model was also in use in planetariums until modern times, when computer driven planetariums took over.
In Ptolemy's model both Venus and Mars have very large epicycles, which we now understand are there to account for the Earth's movement round the Sun.
Because they could see that to assume circular orbits gave the wrong positions for the planets. So they added epicycles with the centre of the epicycle travelling round a circle, while the planet itself was situated on the smaller epicycle.
The complete model had several epicycles for each planet, each one superimposed on the previous one, but the basic epicycle was the one was the one that reproduced the effect of the distance variation (we now know it is due to the elliptical nature of the orbit). While the centre of the epicycle moved round the main orbit (the deferent), the planet did not rotate around the epicycle. This produced the overall effect of a circular orbit with the Sun displaced from the centre of the circle, which is in fact a good model for the shape of most planets' orbits, good enough to delay the discovery of elliptical orbits by well over a thousand years.
In each orbit, further epicycles were added to the model to allow for the effect of the planets' orbits not all lying exactly in the same plane; and other effects.
It was both scientifically accurate and also approved by the Church.
It was his way of explaining why it appeared that planets were moving backwards when Earth passed by them
Individuals with organs of both sexes are called hermaphrodites. The condition has been observed throughout the animal kingdom. It is estimated that roughly one child out of ten thousand is born with organs of both sexes.
In order to get there, you have to count to "one thousand" a thousand times.
M stands for a thousand. and CF - cubic feet. MCF - thousand cubic feet, thus MMCF - thousand of thousand cubic feet which is just million cubic feet
One thousand meters is a kilometer.
"Milli" means "thousand", so there are one thousand millivolts on one volt. 120 volts times one thousand, equals 120,000 millivolts.
It was both scientifically accurate and also approved by the Church.
It was both scientifically accurate and also approved by the Church.
There are probably several thousand Maple Groves throughout the world.
Billions have done so throughout the last two thousand years.
The antagonist in "I Have Lived a Thousand Years" is the Nazi regime and its ideology. As Elli, the protagonist, recounts her experiences during the Holocaust, the oppressive and brutal actions of the Nazis are what she is up against throughout the book.
It is estimated that there are over 40 thousand basketball players in organized leagues throughout America. This includes college and the NBA. In all, over 145 thousand people play basketball for leisure.
The average number of sexual partners a person will have in their lifetime varies depending on factors such as culture, personal beliefs, and individual choices. Studies suggest that the average number of sexual partners for men and women in some countries ranges from 7-15.
There were significant times throughout history without a presidential pay raise. One was from 1969 and 2001 the presidents salary was raised to 100 thousand dollars. Another one is from September 24, 1789 to March 3, 1873 after 84 years the page range went from 25 thousand to 50 thousand.
Goldbob travels around a lot of places throughout the game but I believe he should be in Poshley Heights if you're supposed to find him.
With more than 8 thousand families throughout the U.S. territory, the NAVAJO fought for their land between 1861 to 1864. F0X_F1r3
The name of God of which you asked (which, incidentally, isn't pronounced that way), is used close to seven thousand times throughout the Hebrew Bible, starting with Genesis 2:4.
thousand time thousand makes a millon