1. Space: astronomical phenomena
Light, cycle of day and night, seasons
Space: astronomical phenomena

2. What is light? Radiation visible to the human eye.
Carries energy from :
Natural source (Sun)
Artificial source (Light bulb)

3. Properties of light 1. Type of radiation visible to the human eye
2. Can come from a natural source (sun) or an artificial source (light bulb)
3. The sun’s light carries energy. (Luminous energy)
4. Travels extremely fast ( km/s). 10,8 millions time faster then a car (100km/h)
5. Travels in a straight line.
6. When light hits an object, part of it is reflected and part of it is absorbed.
7.White light is a mixture of all the colour of the rainbow.

4. What is earth’s rotation
Earth spinning on an axis that passes throught its pole
It takes 24 hours
West towards east
Causes day and night
This Photo by Unknown Author is licensed under CC BY-ND

5. The apparent motion of the sun
This apparent motion is due to Earth’s rotation
It rises in the east
Appears to be in the south at noon
Sets in the west
The apparent motion of the sun

6. What is Earth’s tilt?
Angle formed by its axis of rotation and an imaginary axis that runs perpendicular to its orbit.
23⁰
Affect the lenght of day and night (location)
Causes the seasons (with the revolution)
This Photo by Unknown Author is licensed under CC BY-SA

7. During summer ( North hemisphere tilted toward the Sun)
More light than darkness in North hemisphere
More darkness than light in South Hemisphere
Equator : Light and darkness are equal
The North Pole is constantly in light
This Photo by Unknown Author is licensed under CC BY-ND
During summer ( North hemisphere tilted toward the Sun)

8. During winter ( South hemisphere tilted toward the Sun)
More light than darkness in South hemisphere
More darkness than light in North Hemisphere
Equator : Light and darkness are equal
The South Pole is constantly in light
This Photo by Unknown Author is licensed under CC BY-SA
During winter ( South hemisphere tilted toward the Sun)

9. What is Earth’s revolution
Movement of the planet around the Sun
Travels in an oval pathway (Orbit)
The orbit takes 365,25 days
Causes the seasons (combined with the Earth’s tilt)
What is Earth’s revolution

10. What is a season
The time it takes Earth to go from an equinox to a solstice or from a solstice to an equinox.
Equinox = Start of spring or fall
Solstice = Start of summer or winter
The seasons are opposite in the Southern Hemisphere compare to the North Hemisphere
Last 3 month
This Photo by Unknown Author is licensed under CC BY-NC-ND

11. What is a season December 21 to March 21 = Winter
March 21 to June 21 = Spring
June 21 to September 21 = Summer
September 21 to December 21 = Fall
Summer Solstice (June 21). Longest day in North Hemisphere
Winter Solstice ( December 21). Shortest day in North Hemisphere
Fall equinox ( September 21) Day and night are equal
Spring equinox ( March 21) Day and night are equal

12. Temperature
During summer, it is warmer because the Sun’s rays are more direct and because days are longer than nights.
During winter, it is colder because Sun’s rays are slanted and indirect and because nights are longer than days.