The Reasons for the Seasons

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Presentation transcript:

The Reasons for the Seasons Notes & Study Guide

Review of Time Concepts Day – the amount of time it takes Earth to rotate once on its axis Month – the amount of time it takes the moon to revolve around Earth one time Year – the amount of time it takes for the Earth to revolve around the Sun one time

Earth’s Orbit Earth’s orbit is elliptical. However, the eccentricity is so low that you might confuse it with a perfect circle!

Seasons in the Northern Hemisphere Earth’s axis is tilted 23.5 degrees. The axis points to the North Star (Polaris).

Equinoxes and Solstices Each marks the beginning of a new season: Summer Solstice – longest day of the year Winter Solstice – shortest day of the year Autumnal Equinox – equal day and night Vernal (Spring) Equinox – equal day and night

Axial Tilt & the Seasons The hemisphere tilted towards the Sun experiences summer (more direct solar angle, more energy absorbed, higher temperatures) The hemisphere tilted away from the Sun experiences winter (less direct solar angle, lower energy absorption, lower temperatures)

To Study… This presentation Lab activities completed in class Quizlet Quiz is worth approximately 21 points and is two pages long.