Lessons in Astronomy (1647) - Page 29

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A detailed woodcut or copperplate engraving of an armillary sphere mounted on a decorative turned pedestal base. The sphere represents the celestial coordinate system and includes several inscribed rings and bands.

Key features and inscriptions within the diagram include:

NORTH POLE (Polus Boreus) at the top and SOUTH POLE (Polus Austrinus) at the bottom of the meridian ring.
MERIDIAN: The outer vertical ring, graduated with degrees.
RATIONAL HORIZON: The broad horizontal ring bisecting the sphere.
SOLSTITIAL COLURE: The solstitial colure.
ARCTIC and ANTARCTIC CIRCLES: The Arctic and Antarctic circles.
SUMMER TROPIC (Tropicus Æstivus) and WINTER TROPIC (Tropicus Hyemalis).
EQUINOCTIAL: The celestial equator.
ZODIAC: The diagonal broad band representing the ecliptic, featuring zodiac symbols and degree markings.
AXIS OF THE POLE: The central rod representing the Earth's axis.