The father was transferred to Landskrona in 1563, where Jon Jakobsen assumed the surname Coronensis, which he changed to Venusinus after the island of Ven became widely known due to the observatories built there by Tycho Brahe.
The position in Herfølge was one of the most lucrative in the country, but Venusinus appears to have preferred life in the capital, and he moved to Copenhagen in 1587 where he was made pastor of the Church of the Holy Ghost.
He petitioned Christian IV to abolish baptismal exorcism; his request was not granted, but in a partial success for Venusinus, the king himself had one of his children baptized without the ceremony.
Although Venusinus was not on good terms with the Copenhagen academy, he was appointed professor of physics (i.e. natural sciences) "by royal command" in 1600, under which title he undertook the construction of a botanical garden.
In 1607, Venusinus was endowed with Soro Abbey, which allowed him to retire from all paid academic work, and he intended to focus on compiling a history of Denmark, but he died, around the age of fifty, on 30 January of the following year.