This instrument is clear evidence of the links between the astrolabe and astrology. On one side is an astrolabe for a single latitude, and on the other an astrological volvelle, used to find the positions of planets and other celestial bodies, especially in relation to the traditional astrological houses.
This ancient Chinese map of planet Earth's northern sky is part of the Dunhuang Star Atlas, one of the most impressive documents in the history of astronomy. The oldest complete star atlas known, it dates to the years 649 to 684. In this example showing the north polar region, a very recognizable Big Dipper, part of the modern constellation Ursa Major, lies along the bottom of the chart.
Greek Muses In ancient Greece. The 9 Muses were considered sources of knowledge and providers of inspiration to creators of literature and art. Almost everyone should still have a shrine to honor them. Calliope (Epic Poetry) Clio (History) Erato (Love Poetry) Euterpe (Music) Melpomene (Tragedy) Polyhymnia (Hymns and sacred poetry) Terpsichore (Dance) Thalia (Comedy) Urania (Astronomy)
Rather like an alethiometer "Astrolabes are problem solving instruments – they compute things such as the time of day according the position of the sun and the stars in the sky. Like a computer, you input information and then you receive output. They were typically made of brass and had a 6 inch diameter, although as we will see much larger ones were made."
Diptych Dial, by Thomas Tucher, Nuremberg, c. 1620. "Diptych dials are portable instruments, usually made from ivory. They were mainly produced in Nuremberg from the late fifteenth century onwards. They are based on the principles of vertical and horizontal sundials."