Planetary Orbits, Plate 18 from "The Celestial Atlas, or the Harmony of the Universe"

Astrolabe and Quadrant

Astronomical Signs

Line Passing Through the Three Great Stars of Andromeda

God Surrounded by Stars and Planets

Julerno Noted Paris Astrologer Explains the Scientific Basis of Astrology

The Ring of Stars Known as the Milky Way

The Great Arabian Scholar and Astrologer Albumazar

Tycho-Brahe's Astrolabe

Medieval French Shepherd Orients Himself by Observing the Stars

Bayeux Tapestry: at the Coronation Astrologers are Dismayed by the Appearance of Halley's Comet

Celestial Planisphere Showing the Signs of the Zodiac

Horizon

Astrolabe, 1216

Planetary Orbits, Plate 18 from "The Celestial Atlas, or the Harmony of the Universe"

Astronomers Looking Through a Telescope, Detail from a Map of the Constellations

The Situation of the Earth in the Heavens

Chart Describing the Movement of the Planets, from a Celestial Atlas, or the Harmony of the Universe

The Sun in His Chariot and the Signs of the Zodiac, Illustration from Ptolemy's Tetrabiblos, 820 AD

The Conjunction of the Planets, from "The Celestial Atlas, or the Harmony of the Universe"

Moorish Astrolabe, from Cordoba, 1054

Ptolemaic System, from "The Celestial Atlas, or the Harmony of the Universe"

The Berselius Astrolabe, Late 14th, 15th

Planetary Orbits, Plate 18 from "The Celestial Atlas, or the Harmony of the Universe"

Chart Describing the Movement of the Planets, from a Celestial Atlas, or the Harmony of the Universe

Celestial Planisphere Showing the Signs of the Zodiac

Ptolemaic System, from "The Celestial Atlas, or the Harmony of the Universe"

A Group of Constellations from "Uranometria"

Astrolabe and Quadrant