                  APOD: 2018 May 15 - Kepler s House in Linz

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                  2018 May 15
                                      [2]
                            Kepler's House in Linz
Image Credit & Copyright [3] : Erich Meyer (Astronomical Society of Linz [4] )

Explanation: Four hundred years ago today ( May 15, 1618 [5] ) Johannes Kepler
[6] discovered the simple mathematical rule governing the orbits of the solar
system's planets, now recognized as Kepler's Third Law of planetary motion. At
that time he was living in this tall house on The Hofgasse, a narrow street
near the castle and main square of the city of Linz, Austria, planet Earth [7]
. The conclusive identification of this residence (Hofgasse 7) as the location
of the discovery of his third law is a recent discovery itself. Erich Meyer of
the Astronomical Society of Linz was able to solve the historical mystery [8]
, based in part on descriptions of Kepler's own observations of lunar
eclipses. A key figure [9] in the 17th century scientific revolution, Kepler
supported Galileo's discoveries and the Copernican system of planets orbiting
the Sun instead of the Earth. He showed that planets move in ellipses around
the Sun ( Kepler's First Law [10] ), that planets move proportionally faster
in their orbits when they are nearer the Sun ( Kepler's Second Law [11] ), and
that more distant planets take proportionally longer to orbit the Sun (
Kepler's Third Law [12] ).

                  Tomorrow's picture: the rotating LMC [13]

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    Authors & editors: Robert Nemiroff [25] (MTU [26] ) & Jerry Bonnell [27]
                                  (UMCP [28] )
          NASA Official:  Phillip Newman Specific rights apply [29] .
              NASA Web Privacy Policy and Important Notices [30]
              A service of: ASD [31]  at NASA [32]  / GSFC [33]
                           & Michigan Tech. U. [34]
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Site notes:
  [1] archivepix.html
  [2] image/1805/hofgasse7.JPG
  [3] lib/about_apod.html#srapply
  [4] http://www.sternwarte.at/
  [5] image/1805/Kepler_third_law_in_Harmonices_Mundi_Libri_V_page_189.jpg
  [6] https://en.wikipedia.org/wiki/Johannes_Kepler
  [7] http://astrokepler.at/kepler-tour-Linz.html
  [8] http://www.sternwarte.at/Kepler_Linz/ Kepler_Linz_Hofgasse_7_EN.pdf
  [9] https://www.nasa.gov/kepler/education/johannes
  [10] https://en.wikipedia.org/wiki/
Kepler%27s_laws_of_planetary_motion#First_law_of_Kepler
  [11] https://en.wikipedia.org/wiki/
Kepler%27s_laws_of_planetary_motion#Second_law_of_Kepler
  [12] https://en.wikipedia.org/wiki/
Kepler%27s_laws_of_planetary_motion#Third_law_of_Kepler
  [13] ap180516.html
  [14] ap180514.html
  [15] archivepix.html
  [16] lib/apsubmit2015.html
  [17] lib/aptree.html
  [18] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [19] calendar/allyears.html
  [20] /apod.rss
  [21] lib/edlinks.html
  [22] lib/about_apod.html
  [23] http://asterisk.apod.com/discuss_apod.php?date=180515
  [24] ap180516.html
  [25] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [26] http://www.phy.mtu.edu/
  [27] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  [28] http://www.astro.umd.edu/
  [29] lib/about_apod.html#srapply
  [30] https://www.nasa.gov/about/highlights/HP_Privacy.html
  [31] https://astrophysics.gsfc.nasa.gov/
  [32] https://www.nasa.gov/
  [33] https://www.nasa.gov/centers/goddard/
  [34] http://www.mtu.edu/
