THE EARTH
PHYSICAL GEOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Rainfall
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Altitude of the sun and other inaccessible heavenly bodies
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Curvature of earth’s surface
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None of these
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Detailed explanation-1: -sextant, instrument for determining the angle between the horizon and a celestial body such as the Sun, the Moon, or a star, used in celestial navigation to determine latitude and longitude. The device consists of an arc of a circle, marked off in degrees, and a movable radial arm pivoted at the centre of the circle.
Detailed explanation-2: -The sextant is an instrument used to measure angles. Mainly used at sea, the tool is so named because its arc is one-sixth of a circle – 60 degrees. It adheres to the principle of double reflection hence it can measure angles up to 120 degrees.
Detailed explanation-3: -Micrometer instruments, still usually referred to as sextants, often have an arc graduated to more than 120° using an arc greater than 60°, in this case the graduations extend to 135°, but can only be used to 128°.