TH THE E SU SUN N AND TH AND THE E EAR EARTH TH All Ab About out Day y and Night ght
Ex Explaining laining Day an y and d Nigh ght ■ Ancient cultures explained day and night – The Egyptian sun god, Ra, traveled across the sky each day – Ancient cultures did not understand ■ The Earth rotates on its axis ■ The Sun is stationary
Th The e Ea Earth th an and th the e Sun un • The Earth rotates on its axis - How long do you think it takes for the Earth to make one complete rotation? - What do we see when the Earth rotates?
Th The R e Rotating tating Ea Earth th ■ The rotation of the Earth causes day and night ■ Because of the Earth’s rotation: – The Sun rises on the eastern horizon – The Sun sets on the western horizon ■ During a 24 hour period: – The side of the Earth facing the Sun experiences daytime ■ Daytime: one side of the Earth is illuminated by the Sun – The side of the Earth facing away from the Sun experiences night time ■ Night time: the side of the Earth facing away from the Sun is in darkness
Ex Explaining plaining Da Day y an and d Ni Nigh ght ■ YouTube video explaining day and night – https://www.youtube.com/watch?v=l0OCX3pBcJg
Al All a l about out Ti Time ■ How was time measured in the past? – Observations of: ■ Day and night ■ Position of the Sun ■ Seasonal change
Evidence of the Earth’s Rotation ■ Can you explain what is happening in the two pictures 11:00 AM – Hint: Notice the shadow of the woman in the picture ■ How is her shadow changing? ■ Why do you think her shadow is changing? 4:00 PM
Th Thinking king Abou out t A S A Sun n Clo lock ck ■ This is one design for a solar clock ■ How do you think the solar clock would be used to tell time during the day? – Hint: Look at the shadow – Hint: Would the shadow change during the day?
Th Think k Abou out t Th This! s! ■ How do you think a sun clock would work? ■ Do you think that your shadow would change during the day? – Would the changes in your shadow relate to the time?
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