Aim: What is the relationship between Aim: What is the relationship between latitude and Polaris?latitude and Polaris?

Do now: Using your ESRT, page 5, tell me Do now: Using your ESRT, page 5, tell me the latitude and longitude of the following the latitude and longitude of the following locations. locations. Be sure to locate the equator Be sure to locate the equator and Prime Meridian before determining and Prime Meridian before determining the directions North, South, East or West.the directions North, South, East or West.

1) Yellowstone Hot spot 2) Bouvet Hot spot

3) Tasman Hot spot

1) Yellowstone Hot spot (in North America)

2) Bouvet Hot spot (South of Africa)

3) Tasman Hot spot (Off east coast of Australia)

I. Polaris: The North Star• Brightest star in the

sky.

• Always in the northern sky.

• It is the tail of the little dipper

• Polaris' altitude in the sky above the horizon is equal to an observer's latitude.

WATCH THE ANIMATION

• As your latitude North increases, the altitude of

Polaris increases.

• Polaris’ altitude does not change when you move

East or West

Equator

Equator

Polaris Polaris

420 N Latitude

Equator

Polaris

900 N Latitude

II. How do you find the North Star?

• The “pointer stars” from the big dipper point to the star Polaris.

III. Polaris and Earth• Polaris is located

400 light years away from Earth.

• It is positioned in-line with Earth’s North Pole.

Since Polaris is in-line with the North Pole, the other stars appear to Rotate around

Polaris as Earth Rotates.

The stars appear to rise in the Eastern sky and set in

the Western sky

ClosureClosure

►1. What is the latitude of an observer if 1. What is the latitude of an observer if the altitude of Polaris is 43the altitude of Polaris is 43°?°?

A) 23 NA) 23 N B) 90 NB) 90 N C) 43 NC) 43 N D) 43 SD) 43 S

Answer:

C

►2. A person knows he solar time on the 2. A person knows he solar time on the Prime Meridian and the local solar Prime Meridian and the local solar time. What determination can be time. What determination can be made?made? A) the dateA) the date B) the altitude of PolarisB) the altitude of Polaris C) the longitude at which the person is C) the longitude at which the person is

locatedlocated D) the latitude at which the person is D) the latitude at which the person is

locatedlocated

Answer:

C