what is the significance of Greenwich mean time.please tell tomorrow is my exam and may be come. please answer quickly .if you answered me god will bless you always.
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Answer: As the reference for GMT, the Prime Meridian at Greenwich therefore became the center of world time and the basis for the global system of time zones. It was recommended that the meridian line would indicate 0° longitude. Therefore this also became the start of the Universal Day. The meridian line is marked by the cross-hairs in the Airy Transit Circle eyepiece.
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