Science Starter Pull out your homework (Don’t Turn it In)

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Presentation transcript:

Science Starter Pull out your homework (Don’t Turn it In) How does Earth move in space? Tell me at least 2 ways that Earth moves

Answer Rotates (on its axis) and revolves (in an elliptical orbit)

HOMEWORK Study for your quiz (Monday) Planets Kepler’s Laws Nutation & Precession

Agenda Science Starter Review Last Class Intro to Precession & Nutation Work on homework if you haven’t completed it

Review Complete the worksheet on your desk

NOTES #5: PRECESSION & NUTATION Why can’t we feel the Earth moving?

EARTH’S AXIS IS TILTED Earth does not sit straight in it’s orbit It is tilted at a 23.5° angle

EARTH’S AXIS IS TILTED

THE AXIS CHANGES DIRECTION! Precession – change in direction of the axis without change in tilt This process takes THOUSANDS of years to occur Due to the shape of Earth

PRECESSION Think of it like spinning a top!

PRECESSION See it in action! Video Link

WOBBLE BABY, WOBBLE BABY… Nutation – wobbling around the axis of the Earth that causes a slight change in tilt This process is much faster… only 18 years! Due to the moon and its gravitational pull Think back to barycenter

NUTATION

YOUR ASSIGNMENT Write a two-three paragraph essay to (10-14 sentences)… Define the concepts of precession and nutation Compare and contrast the processes What do you know about Earth’s motion through space? Use your notes! Your essay will be graded on… Scientific correctness of definitions Scientific correctness of comparisons and contrasts At least one way they are similar and one way they are different Following directions for length

Last night’s homework I am going to give you 10 minutes to complete you homework from last night if you haven’t already