10/1/14 Aim: What is the earth’s coordinate system? Do Now: Someone tells you to meet them on Montauk Highway for lunch at 12:30 p.m.. What is the problem with this meeting and how would you fix it? HW: R&H pp.22-24, A&E #18-30

Latitude- angular measurement north or south of the equator Starts at the equator (0) Measured in degrees with a maximum measure of 90 at the north or south pole. The measurement comes from an angle drawn from the surface to the center of earth and then back out to the equator. Latitude lines are also called parallels because the distance between them never changes. The equator divides the earth into a northern and southern hemisphere. In the northern hemisphere if you measure the altitude to Polaris then that will equal your latitude.

Longitude is the angular measurement east or west of the Prime Meridian. Longitude lines connect north pole to south pole and are called meridians. The first line of longitude is the Prime Meridian which runs through Greenwhich, England and is 0 deg. The measurement comes from an angle drawn from the Prime meridian to the center of the earth and back out to that location. The prime merdian and the international date line at 180 deg divide the earth into an eastern and western hemisphere. Longitude lines help to tell time. Because the earth spins west to east at 15 deg/hour (360/24) Each 15 deg in longitude = 1 hour on the clock. As you travel west it gets earlier(wearlier) and as you travel east it gets later.

Earth’s Coordinate System Latitude and longitude are based on angular measurements from the equator and the prime meridian. *In the northern hemisphere the altitude of Polaris = your latitude.

10/3/14 Aim: How do we solve time problems? Do Now- 1. If I am at maximum latitude, what is my number and where am I? 2. What two things divide the earth into a eastern and western hemisphere? 3. What is a meridian? 4. If I am at maximum longitude, what is my number and where am I? 5. In what direction and at what speed does the earth rotate? HW – Track storms

10/6/14 Aim: How do we solve time problems? Do Now: If it is Tuesday, 11:00 am at 45west, what time and day is at 165east? Hint: Draw the diagram from yesterday and label these 2 locations. Determine how many degrees of longitude separate the 2 locations and divide that by 15 to see how many hours separate them. Then just add or subtract the hours from the time of the first depending on whether you went west(wearlier) or east. The day changes when you cross midnight or the date line. HW- Finish lab, track storms, study for latitute and longitude quiz tomorrow.