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The Shrinking Earth

The farther out we peer into the universe, the punier our home planet seems.

Click on each date for more information. Sources:3rd century BCE: Eratosthenes measures diameter of Earth http://www.britannica.com/EBchecked/topic/191064/Eratosthenes-of-Cyrenehttp://www.phy6.org/stargaze/Scolumb.htm#q1http://mathdl.maa.org/mathDL/46/?pa=content&sa=viewDocument&nodeId=646&pf=1…By Amos Zeeberg

Click on each date for more information.


Sources:
3rd century BCE: Eratosthenes measures diameter of Earth

http://www.britannica.com/EBchecked/topic/191064/Eratosthenes-of-Cyrene
http://www.phy6.org/stargaze/Scolumb.htm#q1
http://mathdl.maa.org/mathDL/46/?pa=content&sa=viewDocument&nodeId=646&pf=1

2nd century BCE: Hipparchus approximates distance to Moon

When the Sky Explained Everything

Dr. Edwin C. Krupp has spent more than 40 years researching how ancient cultures worshipped and studied the parade of celestial lights—the movement of the sun, moon, planets, and stars—to make sense of seasonal cycles on Earth. An “archaeoastronomer,” who...READ MORE

Measuring the Universe: http://goo.gl/MqiSw
http://link.springer.com/article/10.1007/BF00329826?LI=true#page-1
http://www.britannica.com/EBchecked/topic/266559/Hipparchus/229468/Solar-and-lunar-theory

1672: Gian Domenico Cassini cracks length scale of solar system out to Saturn

Blind Watchers of the Sky:http://goo.gl/6S3IV
http://www.badastronomy.com/mad/1999/earthsun.html
https://eee.uci.edu/clients/bjbecker/ExploringtheCosmos/lecture16.html
http://www.universetoday.com/44527/saturns-distance-from-the-sun/
http://www.universetoday.com/15311/how-far-is-saturn-from-earth/

1838: Friedrich Bessel makes first measurement to star besides the Sun

Measuring the Universe
Parallax: http://goo.gl/9JTwc
http://earthsky.org/brightest-stars/61-cygni-suns-near-neighbor
http://www.britannica.com/EBchecked/topic/63040/Friedrich-Wilhelm-Bessel]

1913: Ejnar Hertzsprung measures distance to nearby galaxy

How Old Is the Universe: http://goo.gl/gVrDb]
Measurement of Starlight: http://goo.gl/7gy4P
http://www.institute-of-brilliant-failures.com/section1.htm

1924: Edwin Hubble measures distance to Andromeda, nearest spiral galaxy

Alan Hirshfeld: http://www.umassd.edu/engineering/phy/people/facultyandstaff/alanwhirshfeld/
How Old Is the Universe
https://www.spacetelescope.org/about/history/the_man_behind_the_name/
http://www.universetoday.com/30716/distance-to-andromeda/
http://cosmology.carnegiescience.edu/timeline/1929
http://www.aip.org/history/cosmology/ideas/island.htm

1929: Hubble finds more distant galaxy & evidence for expansion of universe

Alan Hirshfeld
http://apod.nasa.gov/diamond_jubilee/d_1996/hub_1929.html
Edwin Hubble: Mariner of the Nebulae: http://goo.gl/JnV9b
http://www.astro.yale.edu/obey/cgi-bin/catalog.cgi?n584
The Expanding Universe: Astronomy’s “Great Debate,” 1900-1931: http://goo.gl/pBNU9
http://apod.nasa.gov/diamond_jubilee/1996/hum_1929.html
http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+7619>

1952: Walter Baade doubles size of known universe by reinterpreting star distances

Alan Hirshfeld
http://ned.ipac.caltech.edu/level5/Sept03/Sandage/Sandage5_2.html
https://www.cfa.harvard.edu/~dfabricant/huchra/hubble/
http://www.institute-of-brilliant-failures.com/section2.htm
http://ned.ipac.caltech.edu/level5/Sept03/Sandage/Sandage2_2.html
http://articles.adsabs.harvard.edu//full/1956AJ…..61…97H/0000112.000.html
http://articles.adsabs.harvard.edu//full/1936ApJ….83…10H/0000022.000.html
http://ned.ipac.caltech.edu/level5/Sept04/Stern/Stern1.html

1965: Radio telescopes pick up distant quasar

http://www.astro.ucla.edu/~wright/CosmoCalc.html
http://ned.ipac.caltech.edu/level5/Sept04/Shields/Shields3.html
http://www.math.kth.se/~lang/distance.htm
http://goo.gl/Q0CTe
http://adsabs.harvard.edu/full/1965ApJ…141.1295S
http://www.space.com/20244-quasar-mystery-discoverer-interview.html
http://en.wikipedia.org/wiki/Maarten_Schmidt

2012: Hubble Ultra Deep Field shows galaxies in universe’s infancy

Ethan Siegel: http://scienceblogs.com/startswithabang/
http://www.spacetelescope.org/news/heic1219/
http://hubblesite.org/newscenter/archive/releases/cosmology/2012/48/text/


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