| 词条 | Navicula de Venetiis |
| 释义 |
A navicula de Venetiis or "little ship of Venice" was an altitude dial used to tell time and which was shaped like a little ship. The cursor (with a plumb line attached) was slid up/down the mast to the correct latitude. The user then sighted the sun through the pair of sighting holes at either end of the "ship's deck". The plumb line then marked what hour of the day it was. Some naviculas had additional information inscribed, such as the latitude of some common English towns, some zodiac signs, etc. [1][2][3][4]References1. ^{{cite journal |journal=Bulletin of the Scientific Instrument Society|year=1992|volume=35|page=22|url=https://www.kristenlippincott.com/assets/Uploads/1992-navicula.pdf|author=Kristen Lippincott|title=The Navicula Sundial|accessdate=2018-07-11}} {{More citations needed|date=July 2018}}{{astronomy-stub}}{{Tech-stub}}2. ^https://books.google.com/books?ct=result&ei=63WaTdiIN8Pg0gHJm-24Bg&hl=en&id=SW7NWRm2MkIC&oi=book_result&pg=PA36&sa=X#v=onepage&q=navicula&f=false 3. ^{{cite web|url=http://www.sites.hps.cam.ac.uk/whipple/explore/astronomy/shipshapedsundial/|title=Explore Whipple Collections - A ship-shaped sundial, dated 1620|website=sites.hps.cam.ac.uk|accessdate=2018-07-11}} 4. ^{{cite web|url=http://adsabs.harvard.edu/full/1961JRASC..55...49S|website=adsabs.harvard.edu|title=1961JRASC..55...49S Page 49|accessdate=2018-07-11}} 1 : Sundials |
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