The density of the upper atmosphere varies according to many factors, and this means that Hubble's predicted position for six weeks' time could be in error by up to 4,000 km.. 
Frédéric François Chopin, ní èdè Pólándi ìkìdetical Franciszek Chopin (surname is ]látinú  in French, and usually  in English, and is sometimes written Szopen in Polish; 1 March shei – 17 October 1849), jẹ́ olùkópojáde orin àti olùtedúrú Omo Pólándì.. 