PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoYou can make your own sundial and use it to mark the time of the day at your place.
- First of all find the latitude of your city with the help of an atlas.
- Cut out a triangular piece of a cardboard such that its one angle is equal to the latitude of your place and the angle opposite to it is a right angle.
- Fix this piece, called gnomon, vertically along a diameter of a circular board a shown in figure.
- One way to fix the gnomon could be to make a groove along a diameter on the circular board.
- Next, select an open space, which receives sunlight for most of the day.
- Mark a line on the ground along the North-South direction.
- Place the sundial in the sun as shown in figure.
- Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible, say \(8:00\ AM\).
- Mark the position of the tip of the shadow every hour throughout the day.
- Draw lines to connect each point marked by you with the centre of the base of the gnomon as shown in figure.
- Extend the lines on the circular board up to its periphery.
- You can use this sundial to read the time of the day at your place.
- Remember that the gnomon should always be placed in the North-South direction as shown in figure.
Sundial aligned at North-South direction
Important!
This is a activity-based exercise. Write the answer in a sheet and compare it with the solution given below.
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