Applet
The Quadrans Vetus is a portable sundial for all latitudes,
indicating the unequal (planetary) hours.
1380 – 1442
1423 - 1461
(Regiomontanus)
1436 - 1467
Applet
This instrument is a portable sundial for all latitudes.
Applet
This instrument is a portable sundial for a single latitude.
(Petrus Apianus)
1495 - 1552
Applet
This instrument is a portable sundial for all latitudes.
Applet
This instrument is a portable sundial for a single latitude.
1581 - 1626
Applet
This quadrant was used to tell the time of day and to simplify astronomical calculations for the Sun (altitude, azimuth, declination, right ascension, position of the Sun in the zodiac).
This quadrant was used to tell the time of day and to simplify astronomical calculations for the Sun (altitude, azimuth, declination, right ascension, position of the Sun in the zodiac).
Applet
This quadrant is a simple dial for a single latitude.
Applet
This applet is computing the planetary (unequal) hours, and many more data by modern astronomical algorithms.