Examkin

Soru

Zorluk: OrtaThe Earth as a Planet and Earth Movements

A live transmission of an event originates from London, located on the Greenwich Meridian (0∘0^\circ), at 3:00 p.m. GMT. If a listener in Town X tunes in to the live broadcast at 8:00 p.m. local time on the same day, what is the longitude of Town X?

  1. 75∘E75^\circ\text{E}Cevap
  2. B
    75∘W75^\circ\text{W}
  3. C
    45∘E45^\circ\text{E}
  4. D
    45∘W45^\circ\text{W}

Cevap

75∘E75^\circ\text{E}
The time difference between Town X (8:00 p.m.8:00\text{ p.m.}) and Greenwich (3:00 p.m.3:00\text{ p.m.}) is 5 hours. Because the Earth rotates 15∘15^\circ every hour, a 5-hour difference equals 5×15∘=75∘5 \times 15^\circ = 75^\circ of longitude. Since Town X is ahead of Greenwich time, it lies in the Eastern Hemisphere, making the longitude 75∘E75^\circ\text{E}.

Adım Adım Çözüm

1
Calculate the time difference between Town X and London (0∘0^\circ).
8:00 p.m.−3:00 p.m.=5 hours8:00\text{ p.m.} - 3:00\text{ p.m.} = 5\text{ hours}
Determining the total solar time separation between the two locations.
2
Convert the time difference into longitudinal degrees using the Earth's rotation rate (15∘15^\circ per hour).
5 hours×15∘/hour=75∘5\text{ hours} \times 15^\circ/\text{hour} = 75^\circ
The Earth completes a 360∘360^\circ rotation in 24 hours, which equals 15∘15^\circ per hour.
3
Determine the direction (East or West) based on whether local time is ahead or behind GMT.
Town X time (8:00 p.m.8:00\text{ p.m.}) is ahead of GMT (3:00 p.m.3:00\text{ p.m.}), so Town X is located to the East.
Places to the east of the Prime Meridian experience sunrise and local noon earlier than places to the west ('East gain, West lose').

Anahtar Kavram

Calculating Longitude from Local Time Difference and GMT
Bu soruyu puanla

Konular

The Earth as a Planet and Earth Movements

Bu konudan daha fazla soru