The Earth and its Seasons:

The Earth and its Seasons:

Observations: It is colder in the winter and warmer in the summer.

Do you think the earth is closer to the sun in the summer? What do you know about the position and path of the sun in the summer, compared with the winter?

The Earth and its Seasons:

In Arizona, it is colder in the winter and warmer in the summer. The sun is higher in the sky in the summer than in the winter Sunrise and sunset points change with the seasons And... the seasons are reversed in the southern hemisphere.

How can we explain this? We pause for a demonstration... with globe and light source.

Review:

March 21: first day of spring, sun crosses the celestial equator going north June 21: first day of summer, sun as far north of the equator as it can go Sept 21: first day of autumn, sun crosses the celestial equator going south Dec 21: first day of winter, sun as far south of the equator as it can go

Now, why does sunrise and set point change?

Project: plotting the path of the sun during one day. Volunteers? (We will take the model outside later)

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