Castel Gandolfo & the Vatican Observatory

Notable & intriguing

• The Vatican Observatory (Specola Vaticana) traces its lineage to Pope Gregory XIII’s 1582 Gregorian-calendar reform observatory; it was refounded in its modern form by Leo XIII in 1891 “so that everyone might see clearly that the Church and her Pastors are not opposed to true and solid science.”

  Leo XIII, motu proprio Ut Mysticam Sponsam, 14 March 1891.

• In May 2008 Vatican Observatory director Father José Funes told the Vatican’s L’Osservatore Romano that intelligent extraterrestrials could be considered “our brothers” — a widely reported statement understood as Church accommodation of the question.

  L’Osservatore Romano, 14 May 2008; AP, Reuters.

• The Vatican Advanced Technology Telescope (VATT) on Mt. Graham, Arizona — Specola Vaticana’s working instrument since 1993 — is co-operated with the University of Arizona Steward Observatory. Its primary mirror is a 1.83 m honeycomb cast at the U. of A. Mirror Lab, the first telescope to use the now-standard “spin cast” mirror.

  Sky & Telescope, May 1993; University of Arizona Steward Observatory archives.

• Mt. Graham, the site of VATT and the Large Binocular Telescope, is sacred to the Western Apache and was the subject of decades of litigation by Apache groups and environmental organisations opposing the observatory construction (1989–2005). The Vatican Observatory Foundation has remained directly involved in the Apache–observatory dialogue since.

  U.S. Forest Service EIS, 1988; Helfand, Mountain of Conflict, 2002.

Public-record items already documented about this subject. Folklore is labelled. Sources cited where the specificity warrants it.