Editing Indian Standard Time (section)

==Calculation==
[[File:IST-Mirzapur.svg|thumb|Location of Mirzapur (near Allahabad) and the 82°30’ E longitude that is used as the reference longitude for IST]]

Indian Standard Time is calculated from the reference longitude of IST at 82°30'E passing near [[Vindhyachal]] of [[Mirzapur district]] in Uttar Pradesh.<ref name="bbc" /> In 1905, the meridian passing east of Allahabad was declared as a standard time zone for [[British India]] and was declared as IST in 1947 for the [[Dominion of India]].<ref>{{cite news |title=September 1, 1947: How Indian Standard Time was introduced in country |url=https://www.timesnownews.com/mirror-now/in-focus/article/september-1-1947-how-indian-standard-time-was-introduced-in-country/806185 |access-date=19 April 2022 |work=www.timesnownews.com |language=en}}</ref> This longitude of 82°30'E was chosen as the [[standard meridian]] for the whole country<ref>{{cite news |title=Indian Standard Time: Lack of Scientific Temper |url=https://timesofindia.indiatimes.com/readersblog/nishant-chandravanshi/indian-standard-time-lack-of-scientific-temper-33370/ |access-date=19 April 2022 |work=[[The Times of India]] Blog |date=10 June 2021 |language=en}}</ref> as it is located centrally between [[western India]] ([[UTC+05:00|local time UTC +05:00]]) and [[northeastern India]] ([[UTC+06:00|local time UTC +06:00]]). Currently, the [[National Physical Laboratory of India]] maintains the Indian Standard Time with the help of the [[Allahabad Observatory]].<ref>{{cite news |title=How Indian Standard Time was introduced in India on September 1, 1947 - Explained |url=https://www.jagranjosh.com/current-affairs/how-indian-standard-time-was-introduced-in-country-on-september-1-1947-explained-1630493926-1 |access-date=19 April 2022 |work=Jagranjosh.com |date=1 September 2021}}</ref>