The immigration and
the Naturalization Act abolished the earlier quota system that was based on
national origin as well as the establishment of new immigration policies that
was based on reuniting immigrant families and also attracting the skilled labor
to the United States. The policies that were put in place were going to change
the demographic makeup of the American population since the immigrants that
were entering America under the new legislation n Asia, Africa as well as the
Latin America.
Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. This model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
The major features of Copernican theory are: Heavenly motions are uniform, eternal, and circular or compounded of several circles (epicycles). The center of the universe is near the Sun. Around the Sun, in order, are Mercury, Venus, the Earth and Moon, Mars, Jupiter, Saturn, and the fixed stars.
Allows calculation of planetary orbital periods around Sun. Allows geometric calculations of planetary distances from Sun. These show nice regularity: more distant planets have longer periods, move slower. Easier to calculate planetary positions than with Ptolemaic model.
I hope this helps!
It is a period of 10 years.
