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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

Ingenious: Lisa Kaltenegger

Lisa Kaltenegger can take you there. That’s the feeling you get after a couple of hours of conversation with the exoplanet researcher: Whether it’s to distant water-worlds or to an undergraduate classroom, her enthusiasm, patience, and humor transport you. After...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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