English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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.

The Correspondence of Johann Georg Hagen, First Jesuit Director of the Vatican Observatory, with Directors of Jesuit Observatories