Question

If it is 12 noon at 60°E Longitude, then explain what would be the time at 30°W Longitude?

Answer 1

Exactly! So in one hour, the earth turns 1/24th of a complete rotation or 15 degrees! Now you remember longitude, Lou. Going right around the earth, from east to west for example, there are 360 degrees of longitude. So, here's another way of putting it: in one hour, the earth turns through 15 degrees of longitude! (That's the yellow arc between the two pink longitude lines that are 15° apart!)!"

Answer 2

The local time of any longitudinal point on the earth is calculated by comparing with the local time of the Greenwich city (0°).

Every 1° of east/west longitudinal distance from the Greenwich city is equals to 4 minutes (before/after) of time difference accordingly.

This theory is also known as the GMT theory.

According to this theory.

If 60° E local time is 12.p.m then the local time of the Greenwich will be 4p.m

At that moment the local time in 30°W will be 1p.m