| 41. | At least 2 teeth must be present in a sextant for it to be scored.
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| 42. | But they're also carrying charts, compass, sextant and radio as a fallback.
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| 43. | He filmed the trip on a 35-mm camera that looked more like a sextant.
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| 44. | A sextant does not require a completely steady aim, because it measures a relative angle.
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| 45. | He trained in astronomy at the Melbourne Observatory in the use of sextants and magnetic instruments.
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| 46. | Gago Coutinho invented a type of sextant incorporating two spirit levels to provide an artificial horizon.
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| 47. | This adaptation of the traditional marine sextant allowed navigation without visual reference to the real horizon.
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| 48. | These large sextants are made primarily of wood, brass or a combination of both materials.
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| 49. | With the development of the sextant, the octant became something of a second class instrument.
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| 50. | In the end, the Hadley octant and later sextant took precedence as instruments for navigators.
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