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# Day and night

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This was created to meet the curriculum outcomes in New Brunswick's Grade 6 Science Space unit.

This was created to meet the curriculum outcomes in New Brunswick's Grade 6 Science Space unit.

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### Transcript

• 1. Sunday, September 7th , 2008 SPACE Day/Night and Seasons
• 2. Day and Night  We have day and night on Earth because of the Earth’s rotation – the earth spinning around and around. (1670 km/hr)
• 3.  The side of the earth facing the sun is in daylight.  The other side of the earth experiences night.
• 4.  As the earth rotates, everyone on earth experiences day and night.  It takes 24 hours for the Earth to rotate once.
• 5. Seasons  If the Earth was perfectly balanced, as it is in this animation, we wouldn’t have different seasons and the sun would always rise and set at the same time every day.
• 6. Seasons  Every part of the Earth would receive an equal amount of sunlight as the earth rotated.
• 7.  But the Earth isn’t perfectly balanced, it’s tilted on its axis…
• 8. …and it’s revolving around the sun.
• 9.  The tilt changes how much sunlight each part of the earth receives.  It is this tilt which makes our days longer or shorter and it’s what causes the seasons.
• 10.  In the summer, we’re tilted towards the sun.  Our days are longer and we receive more direct sunlight (which makes it hot).
• 11.  In winter, we’re tilted away from the sun.  Our days are shorter and we receive less direct sunlight (which makes it cold)
• 12.  Animation  Video  Seasons Game
• 13. Time and movement of earth and moon around sun  Animation