calculate everything himself. He also limited himself by being happy to stay in Hijum. He must have written quite a bit by necessity, but he did not ever publish. In 1829 a booklet titled Levensberigten van Arjen Roelofs (Life of Arjen Roelofs) was published by a farmer acquaintance Worp van Peyma from Ternaard. He was able to read Roelofs' hand written notes. Most of these have since been lost. The Eisinga Planetarium has a telescope made by Roelofs, and some of his manuscripts. Also the Tresoar in Leeuwarden has a small collection of manuscripts. 18th-century Dutch astronomers People from Leeuwarderadeel 1754 births 1828 deaths 19th-century Dutch astronomers