death_place death_date birth_place nationality birth_date article_title name occupation
uppsala , sweden 6 december 1974 -lrb- age 84 -rrb- sundsvall , sweden swedish 22 may 1890 per collinder
 per collinder astronomer
per collinder

per collinder -lrb- 22 may 1890 sundsvall -- 6 december 1974 uppsala -rrb- was a swedish astronomer .
he is known for a catalog of open clusters that he published in 1931 , which is today known as the collinder catalog .
he has written two books `` history of navigation '' and `` worlds in orbit '' .
he was married twice , and his first wife gave him four children .
