Indian Standard Time is calculated on the basis of 82°30′ E longitude from the clock tower in Mirzapur near Allahabad Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.
Why is India’s time zone 30 minutes different?
So why are some cities 30 or 45 minutes off? That has largely to do with the politics in each of those places. For example, in New Delhi, India, they found themselves halfway between two meridians, and therefore decided to be 30 minutes between each, as opposed to adopting one time or the other.
Who decides the time zone?
As Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full rotation of 360 degrees. The scientists used this information to divide the planet into 24 sections or time zones. Each time zone is 15 degrees of longitude wide.
Why does China only have one timezone?
Why are the clocks in Urumqi, China, so far out of kilter with the cycles of the sun? Because of a legacy of Mao Zedong and the Communist Party’s desire for unified control. Though China is almost as wide as the continental United States, the whole country is officially in just one time zone — Beijing time.
What countries have a 30 minute time difference?
By 1929, the majority of countries had adopted hourly time zones, though some countries such as Iran, India and parts of Australia had time zones with a 30-minute offset. Nepal was the last country to adopt a standard offset, shifting slightly to UTC+05:45 in 1986.
What are the 24 time zones called?
From east to west they are Atlantic Standard Time (AST), Eastern Standard Time (EST), Central Standard Time (CST), Mountain Standard Time (MST), Pacific Standard Time (PST), Alaskan Standard Time (AKST), Hawaii-Aleutian Standard Time (HST), Samoa standard time (UTC-11) and Chamorro Standard Time (UTC+10).
What is EST in Mountain time?
|Eastern Standard Time (EST) to Mountain Standard Time (MST)|
|8 am EST||is||6 am MST|
|9 am EST||is||7 am MST|
|10 am EST||is||8 am MST|
|11 am EST||is||9 am MST|