Heikki Oja (born 20 May 1945 in Helsinki, Finland) is a Finnish docent of astronomy, Doctor of Philosophy and the former director of the almanac office of the University of Helsinki.
Oja has written dozens of informative books accessible for the general public and has appeared on the radio explaining about astronomy and space research.
[3] Heikki Oja has had a great influence in the development of the Finnish astronomy association Ursa since the 1970s.
He was the editorial secretary of the Ursa publication Tähdet ja avaruus for about fifteen years.
[4] This list is only a small selection of the works written or edited by Heikki Oja.