India has a vast longitudinal extent. Since many meridians pass through it, it is important to adopt the local time of one central meridian of a country as the standard time for the country. Thus, we need a standard meridian for the country. In India 82 ½ °E longitude determines the standard time.
What is Indian Standard Time Class 9?
-In India, the longitude of 82° E meridian is regarded as the standard time for the whole country and is known as the Indian Standard Time (IST). -Indian Standard Time which passes through Mirzapur, in Uttar Pradesh is calculated on the basis of 82°30’E longitude.
What is the importance of Indian Standard Time?
India has the IST as it’s standard time because if it wouldn’t have been there, the country would have difference of 2 hours (as India is a large country and has a large East-west extent — there’s a difference of 2 hours from Gujarat in the west to Assam in the east). Hence, IST is an important meridian of longitude.
What is standard time Class 9 very short answer?
Standard time refers to the fixed time for places falling in the same meridian, set in a country by law. Changes continuously with the change in longitude. Remains the same for a particular country. Places on the same longitude have the same local time.
Why is standard time necessary?
The local time of the standard meridian is taken as the local time for the whole country. This concept of standard time for the whole country is needed because time varies with change in longitudes. If all places on different meridians follow their own local time, there would be confusion and chaos.
Why is the standard time considered necessary Class 9?
As the local TIMe differs by 4 minutes at every longitude, it would create a lot of confusion regarding time for any country as a whole which may stretch across several longitudes. Therefore each country selects a central meridian and the local time of this meridian is the standard time of that country.
What is a standard time Class 9?
Answer: Standard time is the synchronization of clocks within a geographical area to a single standard time, rather than using solar time or a locally chosen meridian (longitude) to establish a local mean time standard.