Latitude, Longitude, and

Time

September, 2011

Coordinate System

A system used for determining the coordinates of a point.

Coordinates = Numbers

Latitude and Longitude System is used to locate points on

Earth.

Latitude•The angular distance north or

south of the Equator.– Measured in degrees N or S from

the Equator.– There are 90° N and 90° S.– Each degree has 60’ (minutes).

•The Equator is the middle line of latitude between the North and South Pole.– Equator = 0° latitude

Longitude•The angular distance E or W

from the prime meridian.– Measured in ° E or W.– There are 180° E and 180° W.– Each ° has 60’ (minutes.)

•Each meridian (line of longitude) connects the North and South Poles.

Longitude Cont...

• The meridian that passes through Greenwich, England is the Prime Meridian.– Prime Meridian = 0° longitude

• The meridian that is 180° is the international date line.– International Dateline

= 180° longitude

Draw and label the EQUAOTR.

EQUATOR

0° Latitude!

Draw and label the PRIME MERIDIAN.

PRI

ME

MERIDIAN

0° Longitude!

Draw and label the TROPIC OF CANCER.

TROPIC OF CANCER

23.5° N Latitude!

Draw and label the TROPIC OF

CAPRICORN.

TROPIC OF CAPRICORN

23.5° S Latitude!

Draw and label the ARCTIC CIRCLE.

ARCTIC CIRCLE

66.5° N Latitude!

Draw and label the ANTARCTIC CIRCLE.

ANTARCTIC CIRCLE

66.5° S Latitude!

Label the NORTH WEST Quadrant.

PRIME MERIDIAN

EQUATOR

Label it N & W.

NW

Label NORTH EAST.

PRIME MERIDIAN

EQUATOR

Label it N & E.

NW

NE

Label SOUTH EAST.

PRIME MERIDIAN

EQUATOR

Label it S & E.

NW

NE

SE

Label SOUTH WEST.

PRIME MERIDIAN

EQUATOR

Label it S & W.

NW

NE

SE

SW

Time•There are 24 different time

zones on Earth.

Time Cont…• Each time zone is approximately

15 degrees of LONGITUDE apart.– 360° ÷ 24hr = 15°/hr

• The Earth rotates on its axis 15°/hr– 15° × 24 hr = 360°/day = 1

rotation/day

• The sun appears to move across the sky 15°/hr

Latitude & Longitude Directions• Part A: Determine the latitude and

longitude of each point on the map.– Use N or S for latitude– Use E or W for longitude

•Part B: Plot points W, X, Y, and Z using the given latitude and longitude.

Part A: Determine the Lat. & Long. of each point.1. Point A = Lat._______ Long._______2. Point B = Lat._______ Long._______3. Point C = Lat._______ Long._______4. Point D = Lat._______ Long._______

Part B: Plot points W, X, Y, & Z 5. W = 10* S, 40* W6. X = 0*, 140* W7. Y = 40* N, 100* W8. Z = 80* N, 0*

A.

B.

C.

D.

30° S

60° E

30° S 60° E

Polaris (North Star)• The altitude (height) of Polaris = your

LATITUDE on Earth.– Ex. Polaris is 20° above the horizon, your

latitude is 20°N.

Hop on board!

First stop, Central Park, NY!

Big Dipper

Polaris

Pointer Stars

Central Park, New York = 41o NBig

Dipper

Polaris

Pointer Stars

10

20

30

40

50

60

70

0

Measure the altitude of Polaris.

What is the latitude of

Central Park?

Central Park, New York = 41o N

Let’s travel to Tampa, Florida!

Tampa, Florida

0

10

20

30

40

50

60

70

Big Dipper

Polaris

Pointer Stars

Measure the altitude of Polaris.

= 27°N

What is the latitude of Tampa?

Tampa, Florida = 27o N