Question

to calculate the diffetence between the local times of any two places on the earth
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Answer 1

Answer:

To calculate time difference between two places the difference in degrees of their longitudes should be known. This is because the earth is made up of imaginary lines called longitudes which determines the time zone of a place. It consists of 360 longitudes which the sun covers every twenty four hours.

Explanation:

Answer 2

Explanation:

Ground or Earth

A ground symbol (IEC symbol 5017) identifies a ground terminal. It can be used for a zero potential reference point from where current is measured. It is also for electrical shock protection.