File:Cassini's Meridian Line, Basilica di San Petronio, Bologna (26682302855).jpg
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| Description |
Giovanni Domenico Cassini, 1655 The St Petronio’s Meridian - In 1656, after Egnazio Danti’s meridian descruction, during the lengthening of the church, Gian Domenico Cassini, who was a teacher in Bologna, invented and created a new meridian. In order to calculate it, Cassini used some instruments now on show at the Museum. The St Petronio’s Meridian is the longest in the world (length: 67,72m, light hole: 27m from the ground, distance between the solstices : 56m); its length corresponds to the 600000th part of the earth meridian. In 1775, it was restored by the astronomer Eustachio Manfredi, who substituted the iron line with the brass one. Source: <a href="http://www.bolognawelcome.com" rel="nofollow">www.bolognawelcome.com</a> |
| Date | |
| Source | Cassini's Meridian Line, Basilica di San Petronio, Bologna |
| Author | Dimitris Kamaras from Athens, Greece |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This image was originally posted to Flickr by Dimitris Kamaras at https://flickr.com/photos/127226743@N02/26682302855. It was reviewed on 17 May 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:25, 17 May 2022 | | 3,456 × 4,608 (3.33 MB) | Ham II (talk | contribs) | Transferred from Flickr via #flickr2commons |
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