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Geography
6
Name ____________________ Lab
#3 Time
Date _____________________
Today’s
Date ________________
1.
a) What is the Latitude of
the Sun today? (Refer to the
analemma) _________ b) Which latitudes on earth have 24 hours of daylight today?
_______________________ c) Go to http://www.fourmilab.to/cgi-bin/uncgi/Earth to view the earth to see where the sun is shining right now. Scroll down the page to go below the Earthview and click Map, then click Topo Map, then click Update. Notice the area of the world that is experiencing daylight right now. Does that confirm your answer in 1b? (yes or no)
Which
hemisphere receives more sunlight today: Northern
or Southern? (Circle one) 2.
Think of which latitude (latitudes?) has/have 12 hours of daylight today.
Then refer to an atlas and name a location (city & country) that
experiences equal daylight and darkness today. _____________________ 3. a) What is the latitude here in Los Angeles? (degrees only; use an atlas or go back to Lab 1)
_________ b) Does
Los Angeles have more than 12 hours or less than 12 hours of daylight today?
_________ c) Go to http://www.sunrisesunset.com/ to find the times of sunrise and sunset
for Los Angeles today:
Today’s
Date: _________ Sunrise:
_________
Sunset:
________
Hours of Daylight: _________
d)
Seattle’s latitude and longitude are 48N, 122W.
Does
Seattle have more or less sunlight than Los Angeles? (Circle one)
On
the same website, click custom
sunrise and sunset calendar. Then use the website to find the following
information for Seattle:
Today’s
Date: _________ Sunrise:
_________
Sunset:
________
Hours of Daylight: _________
e)
Think of when Los Angeles has the longest day of the year (the longest
hours of daylight).
Use the same website as the previous question to answer the following:
Longest
Day: _________ Sunrise:
_________
Sunset:
________
Hours of Daylight: _________
4.
a) How many degrees of
longitude are there on the globe? _________ b) How
long does it take for the earth to make one complete rotation? ___________
c) How many degrees does the
world rotate in one hour? ________ d)
If you know the longitude of 2 places and you know the time in one of
those places, you can determine the time in the other by using your answer in
the previous question (5c). For
example, when it is 12 noon in London (0 longitude), what time is it in Prague
(15E)? ____________ 5.
Refer to an atlas and the time zone map on page 11 of the lab manual or
pp. 20-21 of the atlas. Given
the time at the first location, determine the time at the second location.
PLACE
TIME DAY
PLACE
TIME
DAY a)
Los Angeles
3 pm Tuesday
Denver
______
_______ b)
New York
4:30 pm Saturday
London
______
_______ c)
South Africa
6 am
Wednesday
Cuba
______
_______ d)
Hawaii
10 am Friday
India (use pg. 12) ______
_______ 6.
Determining Time
without Maps – If you
know the longitude of 2 locations and the time at one of those places, you can
determine the time at the other place without looking at a map.
First, determine the time zone meridian closest to each location.
Time zone meridians are multiples of 15 (0, 15W, 30W, 45W…).
Find the distance in degrees between the 2 meridians.
If the meridians are in the same hemisphere, subtract to find the
distance. If they are on opposite
sides of the Prime Meridian, add to find the distance.
Then divide the distance by 15 to determine the difference in hours.
Of 2 locations, the western one is earlier, the eastern one is later. Example:
Los Angeles (118W) 3 pm
Monday
Kingston, Jamaica (77W) Time? Day?
Round
L.A.’s longitude to 120W and Kingston’s to 75W.
Since the 2 locations are in the same hemisphere, subtract the difference
of longitude (120 - 75), then divide by 15.
That gives an answer of 3 hours, so the cities are 3 hours different in
time. Kingston is east is of L.A.,
so it is 6 pm, Monday in Kingston, 3 hours later than L.A. Use
the method above to determine the following times, without
the use of the Time Zone map. PLACE
HOUR DAY
PLACE
HOUR
DAY a)
New York
9 am
Mon.
Seattle, Wash.
________ _______
Eastern Time Zone
Pacific Time Zone b)
Capetown, S. Africa 5
am Fri.
Denver, Colorado
_______
_ _______
34S, 18E
Mountain Time
Zone
c)
Athens, Greece
9:45 pm Sun.
Hanoi, Vietnam
_______
_ _______
38N, 24E
21N, 106E d)
Berlin, Germany
8:32 pm Wed.
Los Angeles, CA
_______
_ _______
52N, 13E 7.
International
Date Line – The
International Date follows the 180o
meridian in the middle of the Pacific Ocean, but deviates around some islands so
as not to split an island nation into two separate days.
When
crossing the IDL going westward (e.g., flying LA to Tokyo or Australia), the
calendar moves forward one day.
For example, a minute before crossing the IDL it might be 8:20 pm Tuesday,
but two minutes later (after crossing the IDL) it is 8:22 pm, Wednesday. A flight
from LA that leaves on Friday night arrives in Australia on Sunday morning, with
Saturday disappearing because the IDL was crossed! When
crossing the IDL going eastward (e.g., flying Tokyo or Australia to LA), the
calendar moves back one day. For example, it might be 5 pm, Sunday just before a plane
crosses the IDL going east, but after crossing it will be Saturday.
Flights from Asia to the USA typically arrive at an earlier time than
they departed! For example, a
flight from Tokyo to Los Angeles that leaves at 5 pm Sunday
evening arrives in LA at 11 am Sunday
morning! Fill
in the time and day for each of the
following situations
150E
165E
180o
165W
150W Ex.
10am
10 am
8
am Mon
9 am Mon
Mon Sun
11 am Sun
12 pm Sun (a)
__________
3 pm Sat
___________
__________ __________ (b)
__________
___________ ___________
7:30 am Wed __________ (c)
10:15 pm Tu
___________ ___________
__________
__________ (d)
__________
___________ ___________
__________
3:30 am Fri 8.
Review Questions. Answer the
following questions without using any maps.
Show your work. a)
When it is 8 pm Wednesday in Panama City (9N, 80W), what time is it in
Cairo, Egypt (30N, 31E)?
Give time and day:
______________ b)
When it is 3 pm on the west coast of the United States, what time is it
in London? _____________ c)
When it is 8 pm on the east coast of the United States, what time is it
in Beijing, China (40N, 116E)?
_____________
Don’t forget the next page à 9.
A traveler leaves Tokyo (135E) at 5
pm on Saturday evening as the sun is setting, bound for Honolulu, When
the plane arrives in Honolulu (150W), the sun is rising and it is 6
am, Saturday morning! This
happens because the traveler crosses the International Date Line.
How
long is the flight?
To calculate, FIND OUT WHAT TIME IT IS IN HONOLULU WHEN THE PLANE LEAVES
TOKYO. Knowing that, simple
subtraction from the arrival time in Honolulu will give you the flight time.
Show your work below. When
the plane departs at 5 pm, Saturday in Tokyo, what time is it in Honolulu?
______________
(Use the chart below to help you calculate the time in Honolulu) How long is the flight? __________________________
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