Geodesic
Astronomická emise České pošty
Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 4, pp. 1-3 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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On the occasion of the International Year of Astronomy 2009, the Czech Post issued a postage stamp commemorating the 400th anniversary of the publication of Kepler’s work Astronomia nova. The postage stamp portrays Johannes Kepler and schematically explains his first and second law of planetary motion. The first day cover was issued as well.
On the occasion of the International Year of Astronomy 2009, the Czech Post issued a postage stamp commemorating the 400th anniversary of the publication of Kepler’s work Astronomia nova. The postage stamp portrays Johannes Kepler and schematically explains his first and second law of planetary motion. The first day cover was issued as well. 
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     author = {Janout, Zden\v{e}k},
     title = {Astronomick\'a emise {\v{C}esk\'e} po\v{s}ty},
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Janout, Zdeněk. Astronomická emise České pošty. Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 4, pp. 1-3. http://geodesic.mathdoc.fr/item/RMF_2009_84_4_a0/