# Do Now: Why do you think we call the equator the equator?

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Aim 20: Today we will explore how latitude and longitude allow us to locate points on a map
Do Now: Why do you think we call the equator the equator? HW: Latitude/Longitude practice ws

4 Hemispheres The equator splits apart the Northern and Southern Hemisphere The Prime Meridian and International Date Line split the Eastern and Western

N∑W york is in the Northern and Western Hemisphere
Where is NY? N∑W york is in the Northern and Western Hemisphere

1) Latitude Latitude is FATitude Runs horizontal Runs East and West
Measured North and South of the Equator Use degrees N or S Parallel lines that never touch Latitude is FATitude

# of degrees NORTH or SOUTH of the equator LATITUDE

Every line of latitude is parallel to the others

Equator = 0° runs along middle of Earth

North Pole = 90° N South Pole = 90° S

Tropic of Cancer = 23.5° N Tropic of Capricorn = 23.5° S

North Pole Latitude Lines Santa Equator South Pole

2) Longitude Vertical Runs North and South
Longitude Lines cross at the poles Measures how far EAST or WEST of the prime meridian Use degrees E or W

# of degrees by which a place is EAST or WEST of the Prime Meridian
(15° apart) LONGITUDE

Runs through Greenwich, England Prime Meridian
Eastern Hemisphere Western Prime Meridian

Prime Meridian = 0°

International Date line = 180°

North Pole Longitude Lines South Pole

20°N 20°E 20°S 40°W 40°N 60°E

40°N 100°W 45°N 115°W 37.5°N 77°W

3) Writing Coordinates Always write Latitude first, longitude second
Example: 41 N, 75 W 90 S, 45 E

PRACTICE

The diagram above represents a portion of the Earth’s grid system
The diagram above represents a portion of the Earth’s grid system. What is the approximate latitude and longitude of point A?

4) Polaris The North Star Fixed point in the sky It does not move
Part of the little Dipper

5) Altitude of a star The angle between the horizon and a star
Measure this angle

5) The Rule The Altitude of Polaris is equal to the observer’s latitude in the Northern Hemisphere ex: altitude of Polaris =90 degrees Latitude = 90 degrees North Ex: altitude of Polaris =45 degrees Latitude = 45 degrees North

6) Why? Earth is nearly spherical in shape
Polaris is located directly above the Northern Hemisphere To Polaris

7) Navigation As the altitude of Polaris increases, the Latitude increases As you travel east or west, altitude of Polaris remains the same…

Let’s Review Where on Earth will the altitude of Polaris be 90 degrees?  Where on Earth will the altitude of Polaris be on the horizon? What will happen to the alitutde of Polaris as you walk from the equator to the North Pole?

Aim 20b: Latitude Longitude Lan
Do Now: Pick Up Lab and begin HW: Latitude Longitude connect the dots ws

Aim 20c: Today we will practice our latitude longitude skills with a game of battleship
Do Now: pick up battleship worksheet and read through directions HW: test corrections

Rules of the game Each board has 5 ships. One – 6 spaced ship Two – 5 spaced ships Two – 4 spaced ships You are to takes turns calling out coordinates and marking it on your coordinate world sheet. Your opponent will tell you “hit” or “miss” If you miss, it is your opponents turn. If you hit, you keep going until you miss. Opponents should mark every call you make on their game sheet.

One player should always mark the coordinates you call out on your coordinate world map
The other team member should mark every coordinate called out by your opponents on your lettered map You are to takes turns calling out coordinates Your opponent will tell you “hit” or “miss” If you miss, it is your opponents turn. If you hit, you keep going until you miss. The winner sinks all your battleships

Aim 21: How do we tell time using longitude?
Do Now: Why can’t an observer see Polaris when standing at the South Pole? HW: Latitude/Longitude worksheet connect the dots

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

How to find difference in time between 2 locations.
A) Find the difference in longitude B) Divide that number by 15 Example: 75 degrees – 30 degrees = 45 degrees Divide 45 by 15 = 3 Answer: 3 hours

Let’s Practice It’s 3PM at the Prime Meridian. You are located at 90oW. What time is it by you? 2) It is 12:00PM in Los Angeles (120oW). What time is it in New York (75oW)?

How to find the difference in longitude using time
A) Find the difference in time B) Multiply the difference by 15 Example: NY time 4:00 pm California time 1:00 pm Difference = 3 hours 3 X 15 = 45 Answer: 45 degree difference

Let’s Practice You call your friend in London (Prime Meridian) and it is 10:00PM for you. You live at 75 W. Why is your friend mad when they answer the phone? 2) It is 12:00PM in Los Angeles (120 W). It is 9:00AM in Hawaii. What is Hawaii’s longitude?

How are latitude and longitude lines drawn on a globe of Earth?
Latitude lines are parallel and longitude lines meet at the poles. Latitude lines are parallel and longitude lines meet at the equator. Longitude lines are parallel and latitude lines meet at the poles. Longitude lines are parallel and latitude lines meet at the equator.

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