What type of details about ernst zinner can be gathered from the following bio? Bio: ernst zinner -lrb- 2 february 1886 , goldberg , silesia -- 30 august 1970 -rrb- was a german astronomer and noted historian of astronomy . after studies in munich and jena he obtained his phd in 1907 at the university of jena , followed by stays at the university of lund , the university of paris , and the konigstuhl observatory in heidelberg . from 1 february 1910 , zinner worked as an assistant at remeis-observatory , bamberg . here , on 23 october 1913 he rediscovered the comet giacobini-zinner , which had been previously discovered by michel giacobini in 1900 . his main work during this time was on variable stars . after working as a meteorologist during world war i , zinner returned to bamberg , but then moved to munich to work in geodesy . in 1924 zinner received the professor 's title from the university of munich . he was appointed director of remeis-observatory in bamberg , germany , in 1926 and retired in 1956 . during this time his main astronomical work centered on stellar astronomy . his main speciality and interest , however , was renaissance astronomy and the history of astronomical instruments , an area in which he started working in 1925 . his obituaries quote a total of 9000 printed pages on this subject , with the most significant ones focusing on biographies and cataloguing early astronomical works and instruments .
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