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farming communities start as people use the plow for farming.
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Aristotle describes the motions of the planets
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Eratosthenes calculates the size of earth. His result is very close to the earth's actual size.
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Chinese report observing an object in the sky that later became known as Halley's comet
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The Chinese make the first seismograph, a device that measures the strength of earthquakes.
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Claudais Ptolemy draws a complete picture of an earth-centered universe.
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Nasir al-Din al-Tusi gets his own observatory. His ideas about how the planets move will influence Nikolaus Copernicus
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Nikolaus Copernicus publishes his book on the Revolutions of the Celestial Orbs. It says that the sun remains still and the earth moves in a circle around it.
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Johannes Kepler introduces the three laws of the planetary motion
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Galileo uses a telescope to see the rings around the planet Saturn and the moons of Jupiter.
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Maria Cunitz publishes a new set of tables to help astronomers find the position of the planets and stars
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Nicolaus Steno sets forth the basic principles of how to date rock layers.
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Isaac Newton introduces the concept of gravity
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Maria Eimmart draws 250 pictures depicting the phases of the moon. She also draws flowers and insects.
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Caroline and William (sister and brother) discover the planet Uranus.
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Luke Howard assigns to clouds the basic name that we still use today-cumulus, stratus, and cirrus.
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Charles Lyell writes principles of geology. This is the first modern geology textbook.
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Ernst Haeckel proposes the term "ecology" for the study of the environment.
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Bertram Boltwood introduces the idea of "radioactive" dating. This allows geologists to accurately measure the age of a fossil
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Alfred Wegener proposes the theory of continental drift. This theory says that all land on the earth was once a single mass. It eventually broke apart and the continents slowly drifted away from each other.
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Meteorologist Tor Bergron explains how raindrops form in clouds.
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Vincent Schaefer and Irving Langmuir use dry ice to produce the first artificail rain.
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The first human-made object goes into orbit when the Soviet Union launches Sputnik1.
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John Glenn is the first person to orbit the earth.
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Geophysicists Dan McKenzie and R.L Parker introduces the theory of plate tectonics.
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National Academy of Science reports on the dangers of chlorofluorocarbons (CFC) for the earth's ozone layer.
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Cygnuns X-l is is first identified as a blackhole.
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A near meltdown occurs at the Three Mile Island nuclear power plant in Pennsylvania. This alerts the nation to the dangers of nuclear power.
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The first "extra-solar" planet is discovered
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The National Serve Storms Laboratory develops NEXRAD, the national network of Doppler weather radar stations for early severe storm warnings.
