How do we calculate the time difference between two countries?
The earth has 360 imaginary lines called longitudes or meridians running vertically between the poles. Each of these longitudes is called a degree. The 0 degree longitude passing through Greenwich, near London, is considered as standard and the time of all other time zones are calculated accordingly. The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on. In India, the standard meridian is 82-and-half degree. So the time difference between Greenwich and India is 82.5 x 4, which is 330 minutes (5 hours 30 minutes).
If it is 12 noon at 60 degrees E longitude, then what would be the time at 30 degrees W longitude?
Solution:Step 1. The earth takes 4 min to rotate through 1 degree of longitude.Hence, the earth will take 240 minutes to rotate through 60 degrees of longitude ( 60×4)Or the earth will take 4 hours to rotate through 60 degrees of longitude. ( 240/60)(since 1 hour=60 minutes).Thus, we can say that the difference in time between the places lying on 60 degree east longitude and prime meridian(0 degree) is 4 hours.Step 2: as the prime meridian lies towards the west of 60 degree east longitude, so the GMT will be 4 hours behind to the local time at 60 degree east longitude i.e. 8A.M in the morning.( 12P.M _ 4 hours)Step3: now we need to find the difference in time between the places lying on 30 degree west longitude and prime meridian i.e.( 30×4=120 minutes or 2 hours( 120/60).Hence, the time difference between places lying on prime meridian( 0 degree longitude) and places lying on 30 degree west longitude is 2 hours.As the places lying on 30 degree west longitude lie towards the west of prime meridian, so the local time at 30 degree west longitude will be 2 hours behind the time at prime meridian.Thus, the local time at 30 degree west longitude will be 6A.M in the morning ( 8A.M _ 2 hours).
What is the relationship between longitude and time?
One hour of terrestrial time passes for every 15 degrees of longitude. Time zones should theoretically change every 15 degrees of longitude, but political or economic considerations mean that that is rarely the case. There are 360 degrees of longitude in the earth’s sphere, divided by 24 hours in the day gives us the 15 degrees for each hour.Another way of looking at it is that every hour, our spot on the earth rotates 15 degrees toward the east from where we were at the beginning of that hour.If you happen to suffer from dizzy spells, this could be the reason.
Do you think its time to move the center of the world map away from Britain/Europe?
Zero longitude is centered on Greenwich, England because Britain had the greatest navy in the 19th century, did the most nautical charts, and despite that business about the tea in the harbor (which as Mr. Darling said in Mary Poppins, “made it undrinkable, even by Americans”), we and the UK have pretty much been BFF’s. Plus the greatest mathematical astronomer of the age, Simon Newcomb, was a joint U.S. - Canadian product. The French could make a good case for Paris, but the French are nothing if not classy, so they went along.It’s actually a good choice because the opposite longitude, 180 degrees, runs close to Bering Strait and down the middle of the Pacific. So a zero-centered map puts all the earth’s land in the center and doesn’t divide any major land masses. Using any other longitude would split continents in half.So, no.As long as I have the floor, let me show you the worst world map projection:This is the “Peters” Projection. Actually the Gall-Peters Projection since Peters merely rediscovered a projection from decades earlier. Note that the U.S. looks pretty “normal” but equatorial countries are ridiculously stretched north-south.Ahhh, but the Peters Projection shows countries in their true relative sizes. Someone pontificated about that on The West Wing once. Guess what. So do dozens of other far superior projections, like this one:or this one:Or literally dozens of other equal area projections. All of which also show countries in correct relative area and do not introduce that absurd low-latitude distortion. Note that Greenland is in correct relative scale.By the way, note that all of these are centered on zero longitude because, as you can see, it makes sense.
When it is 2 am in 60 degree east what is the longitude of a place whose time is 5am?
well, the answer for this would be 105 degree east.EXPLANATION:1 degree= 4 mins ( 360 degree/ 24 hrs),15 degrees= 1hrhere the difference is 3hrs so it would be 45 degrees.therefore 60+ 45 degrees= 105 degress east longitude.