NCERT 6th Class (CBSE) Social Science: Globe: Latitudes and Longitudes

Question: different local time and standard time.

Answer: Local time and standard time:

Local time: The time according to the longitude of a place is called the local time.

Standard: A more or less central meridian passing through a country is selected to give the standard time of the country.

Question: What is the Indian Standard Time?

Most of India falls in the Time Zone lying between 75° E and 90° E  and therefore, the standard meridian for India is 82 1/2° E which passes through Mirzapur (near Allahabad). The entire country follows the local time of this longitude the time followed all over India is called Indian Standard Time (IST).

Question: How is local time determined?

Answer: It 24 hours to complete one rotation of 360°. This means that the earth spin 15° ( 360/24 ) in one hour or 1° in 4 min. Therefore, a place 1° east of another place will have sunrise 4 min. earlier. Thus, each longitude has its own time which is called the local time of that longitude.

Question: Differentiate between Longitude and latitude.

Answer: Latitude:

1. The angular distance of a place north or south of the equator as measured from the center of the earth.
2. Lines of latitude are draw parallel to the equator and are also called parallel.

Longitude:

1. The angular distance of a place east or west of the Prime Meridian as measured from the center of the earth.
2. Line of longitude are drown parallel to the equator and are called parallels.

Question: What do you understand bu local and standard time?

Answer: Geographers have divided the entire globe into 24 time zone each spanning 15°. The middle longitude of each time zone is taken as the standard meridian and the time on that meridian is generally followed all over the time zone as the standard time.