Astronomical Quadrant (replica)

Astronomical Quadrant (replica)

Usage conditions apply
Downloads
Description
In the Almagest (ca. AD 150) Claudius Ptolemy (ca. AD 90 – AD 168) described a "plinth" that could measure the altitude of the noon sun by projecting the shadow of a peg on a graduated arc of 90 degrees. This reconstruction of that instrument was made for exhibition in the National Museum of History and Technology (now the National Museum of American History).
Location
Currently not on view
Object Name
Astronomical Quadrant (replica)
date made
1965
Physical Description
Vermont marble (Vermarco) (overall material)
Measurements
marble base: 4 in x 56 in x 16 in; 10.16 cm x 142.24 cm x 40.64 cm
instrument: 48 in x 36 in x 6 in; 121.92 cm x 91.44 cm x 15.24 cm
overall: 52 in x 56 3/32 in x 16 in; 132.08 cm x 142.494 cm x 40.64 cm
ID Number
PH.327777
catalog number
327777
accession number
1984.3070
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Comments

Add a comment about this object