Q.Which one of the following longitudes is the Standard Meridian for India?

Think of a map of India. You see the whole country drawn out, a shape that tapers down from the north to a point in the south. Now, if someone asked you where India is on the globe, you wouldn't just point at the map. You'd need a way to describe its position so precisely that anyone, anywhere, could find it. That's what latitude and longitude do — they give every place on Earth a unique address.

Latitude lines run horizontally, like the rungs of a ladder, and they measure how far north or south you are from the Equator. Longitude lines run vertically, from the North Pole to the South Pole, and they measure how far east or west you are from a fixed reference line, the Prime Meridian. So when we talk about the latitudinal extent of a country, we mean the range of latitudes it covers — from its northernmost point to its southernmost point. Similarly, the longitudinal extent is the range of longitudes, from its westernmost point to its easternmost point.

For India, the latitudinal extent runs from about 8°N in the south to about 37°N in the north. The longitudinal extent runs from about 68°E in the west to about 97°E in the east. These numbers aren't just trivia — they tell you something profound about the country's size, climate, and even its time zones.

Now, why does this matter? First, the latitudinal extent directly shapes climate. The southern tip of India sits close to the Equator, so it experiences a hot, humid, tropical climate year-round. The northern parts, especially Kashmir, lie in the temperate zone, where winters are cold and sometimes freezing. This single span of 30 degrees explains why you can be sweating in Chennai while someone in Srinagar is shivering in snow — the same country, but vastly different weather.

Second, the longitudinal extent has a practical consequence: time. The sun rises earlier in the east than in the west. Because India spans about 29 degrees of longitude, there's a difference of nearly two hours in local sunrise times between Gujarat and Arunachal Pradesh. To avoid chaos, India uses a single standard time based on the 82.5°E meridian, which passes near Allahabad. So when it's 9 AM in Delhi, it's also 9 AM in Kohima, even though the sun is already higher in the sky there. …