LOCAL AND STANDARD TIME, things to know
Local time or time deals with position of the said area or zone. A person staying in a part of country and another to a far distant country faces difference in time. Today we will discuses over this matter-why does it happen ?
The sun is overhead at a given meridian, it is 12.00 noon for all places situated at that meridian. This is called International Date Line and it varies from one place to the other. The earth completes one rotation of 3600 in 24 ours. Therefore , the time required for a one degree longitude rotation of the earth is four minutes. Thus various place will show various times of their own. The time differs from one place to the other at the rate of four minute per degree of longitude. As the earth rotates on its axis from west to east all places eastwards from a reference point have a time ahead and all places westwards of it have a time behind. That’s why Bangladesh is ahead of Indian Standard Time and Pakistan Standard Time is behind the Indian Standard Time. Thus the Local Time of the central meridian is treated as the standard time of the country or region concerned. The difference between Local Time and Standard Time is based on this concept.
INTERNATIONAL DATE LINE
To solve this problem “International Date Line” has been adopted to avoid the difference of time from one place to another. For example we can say- if a person travelling westwards up to 180 degree West will put his watch back by 12 hours. The other person travelling eastwards up to 180 degree will have to put his watch 12 hours forward. Thus the watches of the two person meeting at the International Date Line will have the same time but different dates.
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