1 / 17

EQ:What are some historical observations of the sky and concluding theories?

EQ:What are some historical observations of the sky and concluding theories?. Who has been observing our sky and for how long?. Stonehenge 2300 BC. Sumerian star catalogue 1200 BC. Chinese Calendar 1400 BC. Mayan culture 1500 BC – 900 AD. “Planetarium” Cave in SW U.S. More Astronomers.

ralph
Download Presentation

EQ:What are some historical observations of the sky and concluding theories?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EQ:Whatare some historical observations of the sky and concluding theories?

  2. Who has been observing our sky and for how long? Stonehenge 2300 BC Sumerian star catalogue 1200 BC Chinese Calendar 1400 BC

  3. Mayan culture 1500 BC – 900 AD “Planetarium” Cave in SW U.S.

  4. More Astronomers The Greeks – Ptolemy, Aristarchus, Eratosthenes, Aristotle, Constellations, Dark Ages Nicolas Copernicus Tycho Brahe Johannes Kepler Galileo Galilei Isaac Newton Edmond Halley Sir William Herschel Edwin Hubble Clyde Tombaugh Modern era (high tech)

  5. Claudius Ptolemy Geocentric Model

  6. Aristarchus

  7. Eratosthenes Calculated Earth Circumference

  8. Aristotle

  9. Nicholas Copernicus1473-1543 Heliocentric Model with circular orbits

  10. Johannes Kepler1571-1630

  11. Galileo Galilei 1564-1642 Observation !!!

  12. Isaac Newton 1642-1727 Laws of Motion Law of gravitation Momentum Light / color

  13. How do we determine the position of celestial objects? In order to locate objects in the sky, astronomers use the celestial sphere. It is an imaginary sphere around the Earth that all objects in the sky are plotted on. The celestial equator is a projection of the earth’s equator on to the CS. The North Celestial Pole and the SCP are projected points on the CS from the Earth. Zenith is the point straight overhead of the observer. The Celestial Horizon is a projection of the observer’s horizon on to the CS. Two methods are used to locate objects on the CS. One is azimuth and altitude, or arc angle from N toward E and arc angle above the CH. The other method is right ascension and declination, similar to longitude and latitude on the CS.

  14. Time-lapse Photos

  15. Feb. 2006 Time-lapse photo of Mars Aug. 2005

  16. Modern astronomers have recognized a point of apparent star diversion (apex) and a point of star conversion (antapex) 1800 apart in the sky.

  17. A= proper motion B= actual motion C= radial velocity (vr) = observer Measurement of Radial Velocitiesof Celestial Objects A B C Objects with high vr subject to Doppler Effect High receding vr causes lower f light (Red Shift) High advancing vr causes higher f light (Blue Shift) Hubble: Most distant objects we see (galaxies) exhibit Red Shift and >d galaxies have >vr vr = H d (H = 70 km/s / Mpc and 1 pc = 2.1x105 AU)

More Related