seasons day night 2.1

7/28/2019 Seasons Day night 2.1

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Seasons, Day vs. Night, Earth in

Space


2/18

Rotating vs. Revolving (notes)

The earth rotates (spins) on its axis which takes 24hours and results in day and night.

The earth revolves (orbits) around the sun whichtakes 365 days and results in seasons.

For example, the use of the term revolves is correctin this sentence. "The moon revolves around theearth.


3/18

Day & Night

It is the earth's rotation on its axis that results innight and day.

As Newfoundland rotates away from the sun itappears that the sun is setting in the west. In actualfact you are rotating away from the sun to the east.

In the morning it appears that the sun rises in theeast. In actual fact you are rotating towards the sunfrom the west.


4/18

Temps & Cloud Cover

Nightly cloud cover reduces the range oftemperature from day to night.

Clouds reflect heat waves;

heat below clouds is reflected back to earth;

without clouds heat escapes giving colder nights.


5/18

Temps & Cloud Cover

Lack of cloud covercontributes to temperature

patterns in the desert. Lack of cloud cover in the

day results in high dailytemperatures;

however in the night thelack of cloud cover allowsthe heat to escape resultingin cold nightlytemperatures.


6/18

Differences in Day Length

The tilt of the earths axis combined with theearths rotation in orbit around the sun results

in different day lengths. In June, because of the tilt on the earth's axis,

the north pole points towards the sun andreceives more hours of exposure to the sun

hence giving it longer days. You can see that as the earth rotates

Newfoundland "N" will spend more than 1/2 thetime in sunlight. Light until 9:30 PM sunrise at5:30 AM


7/18

Differences in Day Length

In December, because of the tilt on theearth's axis, the north pole points away

from the sun and receives fewer hoursof exposure to the sun hence giving itshorter days.

You can see that as the earth rotates

Newfoundland "N" will spend less than1/2 the time in sunlight.

Here the northern hem. rotates out ofthe sun for long periods. Dark at 5:30PM, sunrise at 8:00 AM


8/18

SEASONS

The tilt on the earth's axis & the revolution ofthe earth around the sun

These two features of the earth-sun relationshipmean that different latitudes on earth receive

different directness of light at different times.

When the sun hits more directly the latitude getshotter temperatures and what they call summer.


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12/18

Equinox and Solstice

Solstice: sun is directly over head @ 12 noon on 23.5

North or South; occurs Dec 21 & June 21; longest day of the year & shortest day of the year.

Equinox:

sun is directly over head @ 12 noon on theequator;

occurs Sept. 21 & March 21; equal length of night and day everywhere on earth


13/18

Tropics vs. The Poles The term tropics fosters images of

warm climates.

In everyday language it refers towarm equatorial climates.

The tropics are located between23.5 degrees north and 23.5degrees south.


14/18

The Tropics


15/18

Tropics vs. The Poles

This is important because the more direct thesunlight the more intense the heat.

The further you move outside the tropics themore severe the seasons.

The length of day varies more the further youmove from the equator.


16/18

Tropics vs. The Poles

When light hits the earth towards the poles it ison a severe angle which decreases the intensity

of heat.

The same light/heat energy is spread over a

greater area

Fig 4.3 Solar Intensity & Latitude in your text


17/18

Latitude

Copy Fig 11-3. The Effects of latitude on Climate

Using the diagram as a guide, explain why areas far fromthe equator experience colder temperatures than places

near the equator


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Summer & Winter Temperatures

There are two reasons for the difference intemperature during these seasons:

more direct sunlight gives greater intensity of heat

longer summer daylight hours means there aremore heating hours and fewer cooling hours

seasons day night 2.1

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