Latitudes and longitudes Flashcards
Who calculated the circumference of the Earth?
Eratosthenes, Greek philosopher
Name the main latitudes and their degrees
Equator - 0
Tropic and Cancer and Capricorn - 23 1/2 N and S
Arctic and antarctic circle - 66 1/2 N and S
North and South pole - 90
Circumference of the earth??
40,075
1 degree = _____ km
111
1 degree = _____ minutes
4
Uses of latitudes
To find the exact location of a place and to measure the distance between 2 places
State the various heat zones and their extent
Frigid, temperate and torrid
which is the mean longitude where does it pass through??
Greenwich or Prime meridian passes through greenwich near london
what are longitudes also known as?
Meridians
If we move to the east we _____ time and if we move to the west we __________
gain, lose
how many time zones and tell the number of longitudes they cover
24 zones, 15 degrees each
State the degree for IST
82*30’
Define standard time
the uniform time based on a central meridian
SN on international date line
- It likes exactly opposite to the Prime meridian
- Crossing the date line changes the day
- If we cross from the east to the west we lose a day and west to east we gain a day
- The international date line curves past russia to ensure that a small part of the country does not have a different day
Characteristics of longitudes
- All places on a longitude will have the same time
- All longitudes are great circles
- The 0 degree longitude is the Greenwich meridian or the prime meridian
Characteristics and uses of great circles
All great circles that intersect bisect eachother
All longitudes are great circles
USES -
Great circle route
Weather and climatic conditions
The time at the Prime Meridian (0° longitude) is noon. If the local time in a place is 4:00 PM, what is the longitude of that place?
The local time is 4 hours ahead of GMT (Greenwich Mean Time).
For every 1 hour difference, the place is 15° of longitude away.
So, 4 hours × 15° = 60°.
Since the place is ahead of GMT, the place is located at 60° east longitude.
The time at the Prime Meridian (0° longitude) is 6:00 AM. If the local time in a place is 9:00 AM, how far east or west is the place, and what is its longitude?
The local time is 3 hours ahead of GMT.
For every 1 hour difference, the place is 15° of longitude away.
So, 3 hours × 15° = 45°.
Since the place is ahead of GMT, it is located at 45° east longitude.
If the local time of a place is 3:00 PM and the time at the Prime Meridian is 12:00 PM, what is the longitude of the place? Is it east or west of the Prime Meridian?
The local time is 3 hours ahead of GMT.
For every 1 hour difference, the place is 15° of longitude away.
So, 3 hours × 15° = 45°.
Since the place is ahead of GMT, it is located at 45° east longitude.
Question 4: The time at the Prime Meridian (0° longitude) is 8:00 AM. What is the time at a place located at 45° east longitude?
Every 15° east corresponds to 1 hour ahead of GMT.
45° ÷ 15° = 3 hours.
So, at 45° east, the local time is 8:00 AM + 3 hours = 11:00 AM.
Question 5: A place is located at 90° west longitude. If the time at the Prime Meridian is 12:00 PM (noon), what time is it at this location?
Every 15° west corresponds to 1 hour behind GMT.
90° ÷ 15° = 6 hours.
So, at 90° west, the local time is 12:00 PM - 6 hours = 6:00 AM.
At 12:00 PM (noon) at the Prime Meridian, what is the time at a place situated at 120° east longitude?
Every 15° east corresponds to 1 hour ahead of GMT.
120° ÷ 15° = 8 hours.
So, at 120° east, the local time is 12:00 PM + 8 hours = 8:00 PM.
