Dipleidoscope

Inventory Number: 
AST24
Dipleidoscope Ploessl

Conceived by Giovanni Battista Amici at the beginning of the 19th c. to determine true noon. The prisms double the solar image when the Sun is not on the optical axis of the telescope. If correctly placed on the meridian, the instrument determines true noon within 5-10 seconds

Data
Date: 
1845 (c.)

Copyright National Hellenic Research Foundation - National Observatory of Athens