![]() The Surya Siddhanta also described a method of converting the local time of an observer to the standard time of Ujjain. Taking a sidereal day to be 24 hours, it is easily computed that the smallest time unit, prāṇa, or one respiratory cycle, equals 4 seconds, a value consistent with the normal breathing frequency of 15 breaths/min used in modern medical research. A nakṣatra māsa, or sidereal month, consists of 30 sidereal days. The ghalikā is 60 palas, and the nakṣatra ahórātra, or sidereal day, contains 60 ghalikās. Time that is measurable is that which is in common use, beginning with the prāṇa (or, the time span of one breath). The sidereal day of ancient Indian astronomy began at sunrise at the prime meridian of Ujjain, and was divided into smaller time units in the following manner: Situated upon the line which passes through the haunt of the demons (equator and 76° E) and the mountain which is the seat of the gods (the North Pole), are Rohitaka and Avanti. Postulating a spherical earth, the book defined the prime meridian, or zero longitude, as passing through Avanti, the ancient name for the historic city of Ujjain ( 23☁1′N 75☄5′E), and Rohitaka, the ancient name for Rohtak ( 28★4′N 76☃8′E), a city near the historic battle-field of Kurukshetra. One of the earliest descriptions of standard time in India appeared in the 4th century CE astronomical treatise Surya Siddhanta. Local time is calculated from a clock tower at the Allahabad Observatory ( 25.15° N 82.5° E) though the official time-keeping devices are entrusted to the National Physical Laboratory, located in New Delhi. The longitude difference between Mirzapur and the United Kingdom's Royal Observatory at Greenwich translates to an exact time difference of 5 hours and 30 minutes. Indian Standard Time is calculated on the basis of 82.5 ☎ longitude which is just west of the town of Mirzapur, near Allahabad in the state of Uttar Pradesh. In military and aviation time, IST is designated E* = Echo*. India does not observe daylight saving time (DST) or other seasonal adjustments, although DST was used briefly during the Sino–Indian War of 1962, and the Indo–Pakistani Wars of 1965 and of 1971. Indian Standard Time ( IST) is the time observed throughout India, with a time offset of UTC+5:30. Location of Mirzapur and the 82.5° E longitude that is used as the reference longitude for Indian Standard Time.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |