Aristarchus’ only extant treatise is “On the Sizes and Distances of the Sun and Moon.” In it he calculated the diameter of the Sun as about seven times the diameter of the Earth, thus estimating the Sun’s volume as about 300 times the volume of the Earth
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The Phoenicians created the first alphabet
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By October 1990, Germany was reunified, triggering the swift collapse of the other East European regimes. People celebrating the fall of the Berlin Wall.
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This years saw an extreme transformation of the role of women in American society for several reasons. The first reason was the process of industrialization, which in turn led to the process of urbanization. As industrialization became more common in the United States, factories and large businesses began to be built. This made the process of manufacturing less physically demanding, allowing women and children to operate machinery. This gave women the chance of working outside of the home and earn independent wages, something that had been very uncommon in the past. Work and wages gave women a sense of independence.
On the other hand, urbanization also led to women's liberation. In rural contexts, women were more tightly controlled by their parents, and then their husbands. There were few activities outside of the home, and domesticity was the accepted norm. With urbanization came a different lifestyle. Women had disposable income and were able to enjoy what the city had to offer, such as private housing and certain types of entertainment (like theatre).
The changing role of women during these years led to a growing sense of independence and a desire for freedom and equality. This gave rise to movements such as the suffrage movement, and the movement for equal wages. Women were very important in the labor and reform movements of the following years. All of these events were very important to the development of feminism.
