Johann Georg Hagen, the first Jesuit director of the Vatican Observatory, carried out an abundant correspondence with other directors of Jesuit observatories between 1906 and 1930. Letters of his correspondents preserved at the Vatican Observatory and a few of his letters at other observatories provide interesting information about the work and problems of Jesuit astronomical observatories at that time. Letters survive from observatories in Europe, North America, Asia, and Australia. A short presentation is given concerning the relationship between Hagen and the other directors and the contents of the correspondence.

中文翻译：

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梵蒂冈天文台第一任耶稣会主任约翰·格奥尔格·哈根与耶稣会天文台主任的通信

1906 年至 1930 年间，梵蒂冈天文台第一任耶稣会主任约翰·格奥尔格·哈根与耶稣会天文台的其他主任进行了大量通信。保存在梵蒂冈天文台的通讯员的信件和他在其他天文台的一些信件提供了有趣的信息关于当时耶稣会天文台的工作和问题。从欧洲、北美、亚洲和澳大利亚的天文台保存下来的信件。简要介绍了哈根与其他董事之间的关系以及通信内容。