Astrolabe Catalogue

 

Image of the tympan or plate - click for larger version
Tympan 1b
Latitude 45°0'
Although the plate is marked with 48° and 41°, inspection suggests that it is in fact engraved for 45°.

Almucantars

Divisions Labelled Style
Divided every 2° from 0° to 90° Labelled every 4° with   (None) numerals Plain line.

Azimuths

Divisions Labelled Style
Divided every 5°  Labelled every 5° with   (Modern) numerals Plain line.

Circles

Type Labelled Style Notes
Equator Plain line.
Tropic of Cancer Plain line.
Tropic of Capricorn Plain line.

Lines

Type Labelled Description
Meridian line
Horizon rectus Horizon Rettus (Latin in Italic script)
Horizon obliquus Horizon Obliques (Latin in Italic script)
Unequal hours Numbered (Numbers in Numbers, stamped script) (Modern), Plain line style.
Horoscopic (great) houses Numbered (Numbers in Numbers, stamped script) (IIII), Hatched line style.
Crepuscule Linea Aurore Sive Crepuscoline (Latin in Italic script)

Inscriptions

Transcription Translation Type
Polus 41 Grad: Pole, 41 Degrees Latitude
48 48° Latitude
MHS Home | Contact Us | ©2006 Museum of the History of Science