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Astronomy and Technology

March 19, 2016 | Author: | Posted in astronomy, nature

Astronomy Timeline – 20 Important Dates

1609 – Galileo uses the telescope for astronomical observations . He discovers 3 of Jupiter ‘s moons , the Moon ‘s craters , and the Milky Way galaxy . He also observed sunspots , which went contrary to the then prevalent belief of celestial perfection . He also observed that Venus went through phases , much like the Moon , giving further support to the heliocentric model of Copernicus

1668 – Isaac Newton builds the first reflecting telescope , which became the prototype of today ‘s telescopes . Because of his experiments on the properties of light , he [banner_entry_middle]

deduces that reflecting telescopes will be more useful than lens-based ones

1675 – Ole Romer , a Danish astronomer , measures the speed of light . He observed that there were discrepancies in his observations of the moons of Jupiter , where the intervals between eclipses would change depending on whether the Earth was moving towards or away from Jupiter

1687 – Isaac Newton publishes his work on the theory of universal gravitation . This heralds the beginning of modern astronomy 1842 – Christian Doppler discovers the Doppler effect , the apparent increase or decrease in the frequency of a wave depending on the direction of motion of the observer . In astronomy , the Doppler effect is important in interpreting observations of distant bodies , particularly stars . The Doppler effect results in either a red-shift or a blue-shift and is used primarily to measure the speed at which the stats approach or recede from us 1860 – Sir William Huggins begins his attempts at spectral analysis . He had a private observatory where he used a spectroscope to make many observations on the spectral emission and absorption lines and analyze tha chemical composition of many heavenly bodies . In his findings he distinguished galaxies from nebulae by the difference in their emission spectra

1903 – Konstantin Tsiolkovskii ‘s work , The Exploration of Cosmic Space by Means of Reaction Devices , is published . He is considered the Father of Astronautics . He had many theories on space flight and rocket propulsion , and his many ideas are in use today , such as the multi-stage rocket design for achieving escape velocity from earth

1905-1916 – Albert Einstein introduces his Theory of Special Relativity in his Electrodynamics of Moving Bodies , and then his Theory of General Relativity in 1916

In his theory of special relativity the speed of light is constant independent of any frame of reference . It showed that time can slow down for an observer in motion . This has been proven in modern experiments Einstein unified his theory of special relativity with Isaac Newton ‘s law of universal gravitation , where he viewed gravity not as a force ‘ but as a manifestation of curved space-time 1923 – .Edwin Hubble shows that galaxies exist outside the Milky Way galaxy . Using the 100 inch Hooker telescope , then the most powerful in the world , he determined that some of the nebulae ‘ seen with earlier telescopes were actually galaxies

1931 – Karl Jansky discovers cosmic radio waves . He built a large antenna could be rotated in any direction . He discovered that there was a… [banner_entry_footer]

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