Question

if it is 8 p.m. on 12th May at Prime Meridian write the dates and time of 150 degree east and 120 degree West​

Answer 1

Answer:

Since the earth makes one complete revolution of 360° in 24 hours, that means it passes through 15° in one hour, that also means 1° in 4 minutes.

As you must know Earth rotates from west to east, so every 15° we go eastwards local time is advanced by 1 hour.

Likewise, if you go westwards, local time is retarded by 1 hour.

So, we can conclude that places east of Greenwich gain time as they see sun earlier, whereas places west of Greenwich see the sun later and lose time.

So, if we know GMT, to find local time, we merely have to add or subtract the difference in the number of hours from given longitude.

(Longitude is angular distance which is measured in degrees along the equator east or west of Prime meridian) to cut in short,basically these are vertical lines which pass through both poles.

Now, the answer of your question;

50° towards east..

East means advanced time.

Divide 50° in 3 parts of 15° each and remaining for easy calculation as you know 15° in longitude means 1 hour.

So, it would be

15°(15×4=60min=1hr)+15°(1hr)+15°(1hr)+ 5°(5°×4=20min)= 3 hours 20 minutes. ahead

i.e 12+3hr 20min=03.20 pm

(Note: as mentioned above 1° in 4 minutes, that's why to calculate how much time in 15°, I multiplied it by 4 )

I really hope you understood it and would be capable of calculating it by yourself

Answer 2

The time and date at 150°E is 6a.m on 13th May.

The time and date at 120°W is 12p.m on 12th May.

Given :

Time and date at Prime Meridian (0°) = 8 p.m. on 12th May

To find :

Date and time at 150° E and 120° W longitude

Solution :

Since 150° E is towards the East, the time would be ahead of that of Prime Meridian.

We also know,

1° longitude makes a time difference of 4mins

Difference in longitude of Prime Meridian and 150° E = 150-0 = 150°

If 1° longitude makes a time difference of 4mins,

150° longitude will make a time difference of (4 × 150) mins = 600 mins = 10 hours

The time at 150° E will be = 8p.m + 10 hours

= 6a.m on the next day

Hence, the time and date at 150°E is 6a.m on 13th May.

Since 120° W is towards the West, the time would be behind of that of Prime Meridian.

We also know,

1° longitude makes a time difference of 4mins

Difference in longitude of Prime Meridian and 120° W = 120-0 = 120°

If 1° longitude makes a time difference of 4mins,

120° longitude will make a time difference of (4 × 120) mins = 480 mins = 8 hours

The time at 120° W will be = 8p.m - 8 hours

= 12p.m on the same day

Hence, the time and date at 120°W is 12p.m on 12th May.

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