knowt

Key Terms

Revolution - causes seasons

Seasons

Equator

Middle Latitudes

North and South Poles

Northern Hemisphere

Southern Hemisphere

Indirect light - 30 degree angle

Direct light - 90 degree angle

Vernal Equinox

Autumnal Equinox

Winter solstice

Summer solstice

Horizon

Shadow

Summer Shadow

Winter Shadow

The 23.5° tilt of the earth on its axis creates Seasons

In what season does the Northern Hemisphere get the most direct

sunlight? Summer Least direct? Winter

If the North Hemisphere is experiencing winter, the Southern Hemisphere is experiencing Summer.

Refer to the diagram below of the earth orbiting the sun with the tilt of the axis pointed to Polaris. PUT THE NUMBER OF THE POSITION BELOW each solstice and equinox and write the date they occur on.

Vernal Equinox Autumnal Equinox Summer Solstice Winter Solstice

Position# 1 Position# 3__ Position# _2_ Position# 4

Date: March 21st Date: September 21st Date: June 21st Date: December 21st

Use the graph below to answer questions 8-9.

Compare the path of the flashlight Sun in the summer sky to the path of the flashlight Sun in the winter sky. How are they alike, how are they different?

Alike: The model shows the Sun rises in the East and sets in the West. Both sets of shadows point to the West in the morning and to the East in the evening.

Different: The Sun for both winter and summer is the highest during the afternoon 12pm.

The summer Sun is higher in the sky than the Sun in winter in the afternoon by 18 cm.

30 cm - 12 cm = 18 cm

During what time of daylight would the blue post in our shadow model board create little or no shadow? Noon in summer

Think of what direction the Sun rises. What direction do the shadows in our shadow board point in the morning? In the morning, your shadow will point towards the west because the sun rises in the east, and shadows always fall in the opposite direction of the Sun.

Is the Sun really moving across the sky to cause these shadows? Explain. Think of the arm dance song.We see the movement of the Sun because the Earth is spinning on its axis counterclockwise. Think U.S. Jeff

9.-10. Identify the 2 seasons for each diagram below.

North Pole season: Summer North Pole season: Winter

South Pole season: Winter South Pole season: Summer