a) Difference between Local and Standard time :
| Local Time |
Standard Time |
| 1) The time of a place when the mid day sun is over head is called local time. |
1) The local time of the standard meridian of a country is called a standard time. |
| 2) It changes from place to place. |
2) It remains same for that particular country. |
| 3) The place on the same longitude has the same local time. |
3) The place on the same longitude has the different standard time. |
Example: If the 1ST is 12.00 noon, the local of Mumbai is 39 minutes – 1ST = 11.21 minutes a.m.
Since Mumbai is on 72°82′ east longitudes, it is 9°45′ behind the 82°30′. Thus the local time of Mumbai is 9.45 x 4 = 38 minutes.
b) Differences between Equator and Prime meridian :
| Equator |
Prime meridian |
| 1) Equator is 0° latitude. |
1) Prime meridian is 0° longitude. |
| 2) Equator divides the earth into parts, i.e. Northern hemisphere and Southern hemisphere. |
2) The Prime meridian divides the earth into two equal parts i.e., Eastern hemisphere and the Western hemisphere. |
| 3) Equator is a circle. |
3) Prime meridian is a semi-circle. |
| 4) It is an imaginary line that runs east and west around the exact middle of the globe. (A horizontal line) |
4) It is an imaginary line running from pole to pole and passing through Greenwich, England. (A vertical line) |
