Question

what is meant by sandayal

Answer 1

first of all it is sandial means it is ancient clock which used sun for showing accurate time

Answer 2

Sundial means a clock used in ancient times to watch time but it was not used for a long time the main reason in its drawback was the reason that it can be used only in the presence of sunlight not at night or on cloudy or rainy days
I hope your doubt is clear now