Question

A sundial work only in the
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Answer 1

Explanation:

Because the sundial works due to the formation of shadows and shadows cannot be formed without light.

Answer 2

only day time.

A sundial contains a gnomon, or a thin rod, that casts a shadow onto a platform etched with different times. As the sun changes relative positions over the course of a day, the rod's shadows change as well, thus reflecting the change in time