World Clock

"We know that world clock understanding is compulsory for the ship driver. But for students of class 7 and above grade, it is very important to understand the world clock system, international time zone and international date time to score high in the examination of geography paper. Many student faces problem in solving the time problems in Geography. I will clear everything with the help of sketches and videos. World time zones: These are the international standard time zones which was agreed in 1884 in the International Prime Meridian Conference. The world time zone was divided into 24 standard time zones. Each zone is a zone of 15 (360÷24) degree longitude span . This was done to keep the uniformity of time at a particular time. Let us understand this mathematics. We know that each longitude differ by 4 degree to another longitude. So for 15 degree there is difference of 60 (15×4) minutes. Therefore it is clear that each time zone ranges 1 hour in terms of time scale and 15 degree in terms of angular scale . So 24 time jones is equal to 24 hours which is the time taken by the earth to rotates at its own axis to complete 360 degree."