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Next in our #SIMSseries on LJS 26, a 13th c. astronomical and mathematical manuscript, what we’ve all been waiting for: diagrams! There are several, a couple illustrating eclipses, and diagrams of an astrolabe and a quadrant. Written in Italy.
🔗:
Access 'Algorismus ; Tractatum de sphaera.' through the Penn Libraries catalog.
Astrolabe crafted by Ahmad ibn al-Sarraj, Syria, dated 729 AH (1328-1329 AD)
from The Benaki Museum, Athens
Astrolabe: Ancient Sky Navigator
The astrolabe is a remarkable ancient instrument used since the 6th century to measure time and locate celestial bodies like the Sun and stars. By sighting these objects against the horizon and meridian, users could determine their altitude using an engraved scale, effectively mapping the sky above them. This tool was essential for astronomy, navigation, and timekeeping.
What Is an Astrolabe?
An astrolabe is a handheld device combining astronomy and geometry. It represents the celestial sphere and allows measurements of heavenly bodies’ positions. By aligning it with the horizon and meridian, users calculated things like the time of day or night and their geographic latitude.
Key Facts
Origin: First appeared around the 6th century CE.
Function: Measures the altitude of the Sun and stars.
Purpose: Used mainly for telling time and navigation.
Design: Contains a map of the sky with calibrated scales.
Users: Astronomers, sailors, and scholars relied on it.
Legacy: An essential predecessor to modern astronomical instruments.
Historical Context
The astrolabe emerged in the early medieval period, heavily influenced by Greek and Islamic scientific traditions. It was later refined in the Islamic Golden Age and spread into Europe, becoming a vital tool in navigation during the Age of Exploration.
Historical Significance
The astrolabe transformed how people understood and navigated the world. It bridged the gap between curiosity about the cosmos and practical needs like timekeeping and traveling long distances. Its principles laid groundwork for modern astronomy and navigation technologies.
Learn More: Astrolabe
Exploring the Astrolabe by Matt Rhodes
The astrolabe was a recurring puzzle where you'd trace out a constellation. We spent a lot of time trying to design a prop that was both astrological and magical. A lot of these designs ended up being needlessly complicated, but they sure were fun to work on.
'Tapestry of the Astrolabes'. Anonymous. 1450-1500.
The Historian: The Collector. "The collector is an historian interested in the physical remains of history. Collectors must constantly add to their collection. In fact, they must procure one important piece for their collection each level. Collectors are unable to advance to the next level if they have not attained an important piece -- even if they have enough experience points." (Ken Frank, AD&D 2e Dungeon Master Guide Sages & Specialists, TSR, 1996)
I looove ma girls
Astrolabe, the French ship under the command of Jules Dumont d'Urville in antarctica, 1838, by Auguste Mayer (1805 - 1890)
