31 5) Altitude of a star The angle between the horizon and a star Measure this angle
32 5) The RuleThe Altitude of Polaris is equal to the observer’s latitude in the Northern Hemisphereex: altitude of Polaris =90 degreesLatitude = 90 degrees NorthEx: altitude of Polaris =45 degreesLatitude = 45 degrees North
33 6) Why? Earth is nearly spherical in shape Polaris is located directly above the Northern HemisphereTo Polaris
34 7) NavigationAs the altitude of Polaris increases, the Latitude increasesAs you travel east or west, altitude of Polaris remains the same…
35 Let’s ReviewWhere 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?
36 Aim 20b: Latitude Longitude Lan Do Now: Pick Up Lab and beginHW: Latitude Longitude connect the dots ws
37 Aim 20c: Today we will practice our latitude longitude skills with a game of battleship Do Now: pick up battleship worksheet and read through directionsHW: test corrections
38 Rules of the gameEach board has 5 ships.One – 6 spaced shipTwo – 5 spaced shipsTwo – 4 spaced shipsYou 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.
39 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 mapYou 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
40 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
44 People on thesame line oflongitude havethe sameLocal Time
45 How to find difference in time between 2 locations. A) Find the difference in longitudeB) Divide that number by 15Example:75 degrees – 30 degrees = 45 degreesDivide 45 by 15 = 3Answer: 3 hours
46 Let’s PracticeIt’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)?
47 How to find the difference in longitude using time A) Find the difference in timeB) Multiply the difference by 15Example:NY time 4:00 pmCalifornia time 1:00 pmDifference = 3 hours3 X 15 = 45Answer: 45 degree difference
48 Let’s PracticeYou 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?
49 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 paralleland latitude lines meet atthe equator.