(3) 75°15' e (2) 43°05' s (4) 75°15' w (1) 43°05' n the approximate latitude...
TRANSCRIPT
(3) 75°15' E
(2) 43°05' S (4) 75°15' W
(1) 43°05' N
The approximate latitude of Utica, New York, is…
Which New York State Landscape Region is located at approximately
43o10’ N & 78oW?
1) Taconic Mountains
2) Manhattan Prong
3) Erie-Ontario Lowlands
4) Allegheny Plateau
Where does longitude come from?
• Earth constantly rotates,Let’s calculate its rate…
It CANNOT be 12 PM (noon) everywhere…
• Longitudes are based upon time!
• The sun only faces one side of the Earth.
15 o / hr !
12 PM (Noon)
Later(past noon)
Earlier(not yet noon)
West is earlier (AM), and east is later (PM)!
If it is 12 PM (noon) at 0o,
what time is it at 180o on the other side of the Earth?
12 AM (Midnight)!
?
12
PM
The map of the world above indicates Longitudes and three important reference Latitude lines for the planet
Earth.What is the time difference between two locations on this map that are separated by 75o of Longitude?
1) 0 hours 2) 3 hours 3) 5 hours 4) 7 hours
What is the time difference between two locations on this map that are separated by 75o of Latitude?
1) 0 hours 2) 3 hours 3) 5 hours 4) 7 hours
ESTCTMTPT
The world map above marks location A, in Angola. If it is 3 PM there, what time is it by the star in Rio de
Janeiro, Brazil
1) 11 AM 3) 7 PM
2) 12 PM (noon) 4) 6 PM
As Earth rotates (from West to East), the sun APPEARS to move through the sky
from East to West!
Where does the sun rise & set?
West East
In fact, everything APPEARS to move through the sky from East to West in circular paths!
Well… not everything.
POLARIS(The North Star)
SPACE
AAAAAAAAAAAAaaaaaahhhhhhhh
hh…
Polaris is ALWAYS over the North pole, making it a useful reference north of the equator. To find it, it is best to use Ursa Major (the “Big Dipper”) as your guide.
The height of Polaris in the sky is equal to your latitude north of the
Equator!
To find latitude north of the
Equator we DO NOT need to
look inside the Earth!
The diagram shows an observer on Earthviewing the star Polaris.
What is this observer’s latitude?
(1) 38° N (3) 52° N
(2) 38° S (4) 52° S
Polaris is at a 90o angle above the North Pole. BY COINCIDENCE,
the North pole is at 90o North
latitude!
Polaris also appears to be at 0o angle to a
person at the Equator (0o latitude)!
The altitude of Polaris = latitude North of
Equator!
Polaris is at 0o Angle
Equator = 0o latitude
Polaris is at 30o
Angle
New Orleans = 30o N
Polaris is at 90o
Angle
North Pole = 90o N
From which New York State location would Polaris be observed to have an altitude closest
to 43° above the northern horizon?
(1) Binghamton (3) Watertown
(4) New York City(2) Utica
The diagram below shows an observer on Earth
measuring the altitude of Polaris.
What is the latitude of this observer?
(1)90° N (3) 43° N
(2) 66.5° N (4) 23.5° N
At which New York State location will an observer most likely
measure the altitude of Polaris as approximately 42°?
(1) Jamestown (3) Oswego
(2) Plattsburgh (4) New York City
If I am at White Plains, NY (410 N latitude)
and I walk to the North, Polaris will appear to
1) Get higher in the sky
2) Get lower in the sky
3) Move to the East
4) Approach the Prime Meridian
Repaso
The altitude of Polaris =
latitude North of
Equator!
Apparent Motion (15o/hr)
Where is Polaris?
Which diagram best represents the view of Polaris to an observer located at the Earth’s Equator?
If I am at White Plains, NY (410 N latitude)
and I walk to the North, Polaris will appear to
1) Get higher in the sky
2) Get lower in the sky
3) Move to the East
4) Approach the Prime Meridian
ND
C
B
A
PersonAngle
ToPolaris
Latitude
A
B
C
D
Longitude COULD NOT BE DETERMINED at sea (“dead reckoning”).
NO GOOD IF YOU WANT TO RULE THE WORLD!!!(£20,000 prize in 1720)
Most important invention was an accurate portable clock (1759). Check time on boat and compare it to time back in London.
Clock, hours, degrees, minutes…GET IT!