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Download A History of Astronomy (Dover Books on Astronomy) by A. Pannekoek, Space PDF

By A. Pannekoek, Space

Well-balanced, conscientiously reasoned learn relates astronomy to political, social stipulations of the day. half I covers historical astronomy, together with Ptolemaic idea; half II discusses Copernicus, Kepler, Newton, legislation of celestial mechanics. half III covers glossy advancements as much as paintings of Eddington. writer observed astronomy as an experience of the brain. Illustrated.

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Extra resources for A History of Astronomy (Dover Books on Astronomy)

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Importantly, Anaximander rejected what was then the prevailing notion that the earth was suspended from or supported by something in the heavens. He held that the earth floated freely in space at the center of the universe. Without reason to move anywhere, the earth, shaped like a short cylinder (we’d call it a soup can today), floated motionless. As for the stars, they were fiery jets, and the sun a chariot wheel whose rim was hollow and filled with fire. ) theorized that what he called aer (air or vapor) was the most basic form of matter and was also the substance that formed the life spirit of animals, the soul of humankind, and the divine essence of the gods.

Pyramids built near Giza, Egypt. The length of each side at the base averages 7553⁄4 feet, and it was originally 4812⁄5 feet high. Some 2,300,000 blocks of stone, each weighing about 21⁄2 tons, went into building the Great Pyramid. While the Chinese, the Babylonians, and the Chaldeans used astronomical observations to help them rule and regulate the living, the ancient Egyptians used the observations and measurements they made to help the dead find their place in the afterlife. Actually, Egyptian astronomers worked for both the living and the dead.

Deneb is also part of the prominent asterism, the Northern Cross, and is the brightest star in that group. Take a good long look at Deneb. Bright as it is—fourth brightest in the summer sky— it is one of the most distant stars visible to the naked eye, fifty times more distant than Vega and several hundred times farther than Alpha Centauri, our closest stellar companion. If you are sufficiently far from sources of atmospheric and light pollution, and the night is clear and dry, you may notice that the Northern Cross lies within a kind of hazy band stretching across the sky.

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