21. The longitudes help us in calculating the time of a. a particular place. b. a particular district. c. a particular country. d. a particular state.
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Every gain or loss of 1° longitude stands for 4 minutes. 360° implies one complete rotation of earth. on every longitudinal degree increase towards west, substract 4 min. After the hours is calculated add(if east) or substract( if west) it with time of GMT.
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