| This picture shows the approximate hours of
sunlight on the first day of summer in the Northern Hemisphere.
This is called North Summer Solstice.
The first day of summer is June 22nd in the Northern
Hemisphere. On that day the North Polar Region is tilted toward
the sun. It is the first day of the winter in the Southern
Hemisphere.
When the Sun shines on a place it heats that place. When it
rotates around to nighttime, it cools. On June 22, the Northern
Hemisphere spends more time in daylight and less time cooling at
night. |
|
In the summer, direct Sun rays are providing more heat. As a result, it
gets warmer as the summer continues.
Meanwhile, the people in the Southern Hemisphere are having shorter
daylight hours. It is winter for them. The Earth's surface there is
cooler.
Take your globe out of the Horizon Ring. Write the approximate number
of daylight hours at these latitudes: between 50N and 60N - 18, between
40 N and 50 N - 15, on the Equator - 12, between 30 S and 40 S - 10 and,
between 40 S and 30 S - 8.
Arrange the following places in the order of how much daylight they
are receiving on June 22nd. Place the number 1 with the place having the
longest daylight hours. Place a 2 with the place having the next longest
daylight period. Continue on through 10, the place receiving the least
daylight at this time.
| _____ Antananarivo, Madagascar |
_____ Newcastle, Australia |
| _____ Houston, Texas |
_____ Madrid, Spain |
| _____ Wellington, New Zealand |
_____ Hanoi, Vietnam |
| _____ Stockholm, Sweden |
_____ Vancouver, Canada |
| _____ Addis Abba, Ethiopia |
_____ Lima, Peru |
|
The way to find the location of the direct Sun rays is to
use the Analemma. On your globe you can find the Analemma in the
Pacific Ocean.
The w ord Analemma is taken from the ancient Greek word for
Sun Dial. You can say the Analemma is a kind of sundial. The
Analemma tells us the position of the Sun's direct rays at
different times of the year.
The Analemma has a calendar where months and days of the
years are printed. This calendar tells us where the direct rays
of the Sun are striking the Earth on any day of the year.
| 1. |
The analemma extends between what two important Sun
lines on the globe? (lines of dashes)
___________________________ &
______________________________
|
| 2. |
Which months are the top and bottom ends of the
Analemma? _____________________ &
______________________________
|
|
Places located between the Tropic of Cancer and Tropic of Capricorn
receive the Sun's direct rays twice a year. For example, find 20N
latitude line on the globe. Look at the Analemma calendar. The direct
rays strike the Earth at 20N on July 23 and May 22.
Find and write the two days that the Sun is directly overhead in the
following locations.
| 3. Havana, Cuba, 23 N? |
a. ____________________ |
b. ____________________ |
| 4. Quito, Ecuador, 0 N? |
a. ____________________ |
b. ____________________ |
| 5. Rio de Janeiro, Brazil, 23 S? |
a. ____________________ |
b. ____________________
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