| 41. | It further uses the armillary sphere and details rules relating to problems of trigonometry and the computation of eclipses.
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| 42. | A large iron armillary sphere stands in the center of the square, supported by six small metal turtles.
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| 43. | Crowning the top of the clock tower was the large bronze, mechanically-driven, rotating armillary sphere.
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| 44. | Many, especially larger building, also had arches and towers topped with nationalistic symbols such as armillary spheres.
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| 45. | This was used alongside a clepsydra clock and waterwheel to power a rotating armillary sphere in representation of astronomical observation.
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| 46. | The armillary sphere is also featured in Portuguese heraldry, associated with the Portuguese discoveries during the Age of Exploration.
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| 47. | A similar flag was introduced for the Portuguese ships that sailed to India, but with a red armillary sphere.
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| 48. | No early Islamic armillary spheres survive, but several treatises on " the instrument with the rings " were written.
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| 49. | The armillary sphere was granted by King Viseu as his personal badge when he was appointed heir of the Crown.
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| 50. | It may be considered to be a simplified, portable armillary sphere, or a more complex form of astrolabe.
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