Question

What is the basis of observing time in a: (i)Sundial (ii)Sand Clock​

Answer 1

Answer:

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Explanation:

A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial.

The sand clock uses the flow of sand (from one glass bulb to another) to measure time. The length of time taken by the sand to pass from one bulb of the sand clock to the other, gives a constant time interval. A sand clock consists of two glass bulbs joined together through a narrow tube.

Answer 2

Answer: (i) A sundial is a device that tells the time of day when there is              sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial.

            (ii)Sundial is based on the fact that the position and length of shadow cast by an object. Changes with the time during the day. It consists of a horizontal circular board with a triangular plate of metal which is fixed vertically on it and kept along north-south direction.

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