The planispheric astrolabe
Shadows draws the front of a Planispheric Astrolabe in a precise and realistic manner. The Limb, the Plate designed for the local latitude, the Rete and the Ruler can be drawn separately or all together. The mobile parts can be moved on screen using the mouse to simulate the use of a real astrolabe.
Lots of drawings can be selected on the front of the astrolabe:
- Altitude circles (almicantarats)
- Azimuth arcs
- Tropical and equatorial circles
- Horizon and twilight arcs
- Layout of the sky (stars and constellations)
- Ecliptic and Zodiac circles
The universal astrolabe
Universal astrolabe can be used anywhere because they are not designed for a given latitude. The ruler and the brachiolus (articulated arm) can be moved on screen with the mouse as on a real astrolabe.
Several drawings can be selected, as well as their resolution.
The back of the astrolabe
One usually starts to use the back of the astrolabe. It allows the user to find the initial data that will be used on the front of the astrolabe in order to solve one of the classical astronomical problems.
The following drawings are available on the back:
- Calendar (months, days)
- Ecliptic longitude of the Sun, Zodiac signs
- Shadow square
- Unequal hours
- Curve of the Equation of Time
The Alidade is mobile and scaled with declination and time.
View the 
Check the quality of drawings by zooming on the following file: 
