Practical Assessment of the Accuracy of the Astrolabe

Autor: Robin Knox-Johnston
Rok vydání: 2013
Předmět:
Zdroj: The Mariner's Mirror. 99:67-71
ISSN: 2049-680X
0025-3359
Popis: Prior to the introduction of the cross staff by the Portuguese about 1514, the only method of taking an altitude of a celestial body at sea was by use of the astrolabe or derivatives of it like the...
Databáze: OpenAIRE