1. APPARENT PATH OF THE SUN
How does the Sun’s path affect the amount of energy received on Earth?

2. HOMEWORK
Textbook: read pages 257 – 260.
Do questions 17,

3. SUN
RISES IN THE EAST SETS IN THE WEST

4. ANGLE OF INSOLATION
Insolation: Incoming Solar Radiation is the sun's energy that enters the earth's atmosphere and surface.
Angle of Insolation: the angle at which the sun’s rays strike the earth's surface.
Intensity: a measure of the amount of radiation that strikes a unit area of the earth's surface.

5. FACTORS THAT INFLUENCE THE AMOUNT OF ENERGY RECEIVED BY THE SUN
Angle of Insolation
lower in the mornings and evenings
Higher in the afternoons
Duration of Insolation
In NY, Sun is out for 15 hours in Summer
In winter, Sun is out only 9 hours
Latitude of maximum insolation
North and South Poles are much colder than the Equator.

6. FACTORS THAT INFLUENCE THE AMOUNT OF ENERGY RECEIVED BY THE SUN
Intensity of Insolation
Higher the angle of insolation, the greater or stronger the amount of energy
Lower the angle, the weaker the amount of energy.

8. High Angle – Sun is directly overhead

9. High Angle – Sun is directly overhead with high intensity of energy - short shadows

10. LOW ANGLE – Sun is low in the sky –low intensity of energy

11. LOW ANGLE – Long shadows, lower intensity of Sun’s energy

12. IMPORTANT DATES JUNE 21: SUMMER SOLSTICE DECEMBER 21: WINTER SOLSTICE
MARCH 21: VERNAL EQUINOX
SEPTEMBER 21: AUTUNM EQUINOX

13. IMPORTANT LATITUDES ZENITH – POINT DIRECTLY ABOVE
JUNE 21 – 23.5 NORTH (Tropic of Cancer)
DECEMBER 21 – 23.5 SOUTH (Tropic of Capricorn)
MARCH 21 & SEPTEMBER  (Equator)

14. SUN’S PATH

15. SUN’S PATH

16. SHADOWS In New York Shadows are always opposite the Sun
Sun’s Path is always in the southern sky.
Shadows are always opposite the Sun
Low Sun, Long shadows
High Sun, short shadows

17. SHADOWS

18. High Noon, December 11 at Reykjavik
Sun does not rise much above the horizon during this time of year.

19. High Sun, Short Shadows