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