Measuring Earth Notes Page 10 Latitude & Longitude Measuring Earth Notes Page 10 ©Mark Place, 2009-2010 www.LearnEarthScience.com

Let’s Look at This Question: How is latitude measured?

To get to the next line of latitude, you must move 10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H To get to the next line of latitude, you must move in which of two directions? Latitude Equator

10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H North South

Latitude is measured and from the North South Equator

Let’s Look at This Question: How is longitude measured?

To get to the next line of longitude, you must move 10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H To get to the next line of longitude, you must move in which of two directions? Prime Meridian

10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H West East

Longitude is measured and from the East West Prime Meridian

Let’s do some plotting.

On the coordinate system, plot the coordinates given in your notes: 10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H D A B C

State the coordinates for each of the letters in the figure above: 10 20 30 40 50 60 70 80 90 15 45 75 105 120 135 150 165 180 E F G H 20°N, 75°E 65°N, 50°W 70°S, 15°E 10°S, 135°W

PLEASE TURN TO PAGE 11 OF YOUR NOTES

BASED ON THE ____________ LATITUDE ALTITUDE BASED ON THE ____________ OF _______________ Demo POLARIS

LATITUDE = ALTITUDE

POLARIS CAN ONLY BE SEEN IN THE HEMISPHERE NORTHERN

25°N, 100°W Altitude of Polaris 25°

30°S, 100°E Altitude of Polaris Can't be seen!

80°S, 65°W Altitude of Polaris Can't be seen!

45°N, 105°E Altitude of Polaris 45°

LONGITUDE BASED ON EARTH’S ROTATION

LONGITUDE EACH HOUR, EARTH ROTATES 15° (360°/24hrs)

HOW MANY TIME ZONES?

HOW MANY TIME ZONES? 24 TIME ZONES 15° APART

People on the same line of longitude have the same Local Time

Example: Two students record a difference in local time of two hours. How many degrees of longitude apart are they? 15° x 2 hours = 30°