The back contains 1 scales of the following types:
Type
(click to view scale details) |
Range & Units |
Numbered |
Geometry |
Location |
| Degree |
0 - 90, Degrees |
Every 10 degrees |
Circular, concentric |
The entire outer circle on the back of an
astrolabe. |
Universal
The back contains a universal with a De
Rojas projection. This projection, which is based on the de
Rojas projection, is found on a rotating plate between the
back of the instrument and the fixed rule. The universal
contains the following:
|
Angle of inclination |
Direction of inclination |
Labelled |
Language |
Script |
Line style |
Notes |
| Tropic of Cancer |
|
N/A |
Numbered from 1 to 12 |
Numbers |
Numbers, engraved |
Plain |
|
| Tropic of Capricorn |
|
N/A |
Numbered from 1 to 12 |
Numbers |
Numbers, stamped |
Plain |
|
The universal contains the following meridians:
| Interval |
Style of line |
Number style |
Description |
| 15° |
Plain |
European Modern |
The hour-line meridians are divided by half-hour
lines |
The universal contains the following parallels:
| Range |
Interval |
Style of line |
Number style |
Description |
| |
10° |
Plain |
N/A |
The parallels are divided by degrees of the
ecliptic |
Stars
The universal contains the following stars.
Click on the star name or modern star name to search for
other astrolabes with the same star.
Star name
(on instrument) |
Modern star
(if known) |
Mediation |
Declination |
Pointer |
