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  1. Astrolabe - Wikipedia

    It serves as a star chart and physical model of the visible half-dome of the sky. Its various functions also make it an elaborate inclinometer and an analog calculation device capable of …

  2. Astrolabe | Definition, History, & Facts | Britannica

    astrolabe, any of a type of early scientific instrument used for reckoning time and for observational purposes. One widely employed variety, the planispheric astrolabe, enabled astronomers to …

  3. ASTROLABE: Free Natal Chart / Horoscope

    Astrology: Free Natal Chart (Horoscope) from Astrolabe, the leader in automated birth chart reports, relationship reports, and transit and progressed horoscope reports.

  4. Astrolabe - World History Encyclopedia

    Aug 31, 2023 · The astrolabe is an astronomical instrument used from around the 6th century to measure time and position by determining the altitude of heavenly bodies like the Sun and …

  5. A beginner's guide to the astrolabe - BBC Sky at Night Magazine

    May 25, 2022 · An astrolabe is an astronomical instrument used since ancient times. It consists of rotating discs and rulers to show the positions of astronomical objects at any given time …

  6. The Astrolabe: A Mathematical Jewel | UC Geography

    Any instrument used to measure altitudes above the horizon can be called an astrolabe, although there is a major difference between the classic “planispheric astrolabe” and a “mariner’s …

  7. What Is an Astrolabe and How Was This Tool Used?

    Aug 27, 2025 · The astrolabe, a historical scientific instrument, served as an analog calculator for various astronomical problems. This ancient device, whose name means “star-taker” in Greek, …

  8. Astrolabe Definition - AP World History: Modern Key Term

    Definition An astrolabe is an ancient astronomical instrument used to measure the altitude of celestial bodies and determine latitude. This tool played a crucial role in navigation and …

  9. Mariner's Astrolabe - Ages of Exploration

    As Europeans began traveling farther distances across seas and oceans, they created a version of the astrolabe for maritime travel. Thus, the mariners’ astrolabe was born. It became widely …

  10. Astrolabe - History Tools

    Nov 19, 2023 · At its heart, the astrolabe consists of a large circular metal plate called the mater that sits vertically on a stand. Both sides of the plate are etched with calibrated circles, lines, …