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A few quick things:

Yes take notes----you will need this. A few quick things:. What is the eccentricity of an ellipse?. How ovular or circular a planet’s orbit is. What is the aphelion/perihelion?. Aphelion: Closest point to the sun in the orbit Perihelion: Furthest point from the sun in orbit

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A few quick things:

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  1. Yes take notes----you will need this A few quick things:

  2. What is the eccentricity of an ellipse? • How ovular or circular a planet’s orbit is

  3. What is the aphelion/perihelion? • Aphelion: Closest point to the sun in the orbit • Perihelion: Furthest point from the sun in orbit -Winter in the northern hemisphere = aphelion -Summer in northern hemisphere = perihelion

  4. What is the focus of an orbit? • Points from which any point on the perimeter of the orbit can be triangulated. • One focus is usually the sun

  5. What is precession? • Earth spinning on a tilted axis causes a additional movement called precession • The axis moves around in a cone shape.

  6. What is a solstice/equinox? • Winter and summer are solstices. They are the points at which the earth is closest or furthest from the sun in orbit. • Spring and fall are equinoxes. They are halfway points between solstices and have equivalent distances from the sun.

  7. What is the earth’s tilt?

  8. What if the tilt was different? • Less TiltIf there was less of a tilt, the seasons would even out into a perpetual spring as the tilt gets closer to straight up and down. All latitudes will get closer to 12 hours of day and 12 hours of night. • More TiltAs the poles tilt further away from the perpendicular, the seasons would get more extreme. Summers get hotter and Winters get colder. The time difference between day and night will get further out of balance.

  9. What is lattitude/longitude? • Latitude measured east to west horizontally across globe. • Equator, tropic of cancer, tropic of capricorn • In northern hemisphere latitude can be measured by angle from polaris (north star) • Longitude measured north to south vertically (pole to pole) • Longitude + latitude = coordinates

  10. What are eclipses? • An eclipse is when an object is shadowed because another object came between it and the light source • We have 2 eclipses: Lunar and solar • Lunar: Sun – Earth – Moon (the Earth’s shadow is cast upon the moon) • Solar: Sun – Moon – Earth (The moon’s shadow blocks out the sun from our vision)

  11. Which one is which?

  12. What are tides? • Tide is the gravitational pull of the moon and sun on the waters on Earth. • This mainly only affects oceans, bays and seas

  13. When the moon and sun line up tides are the most drastic! • This is because they both pull on the oceans in the same direction. • Apogee/Perigee: Point at which the moon is furthest/closest to the Earth • Spring/Neap: Big difference between high and low tide/little difference between high and low tide • Ebb/Flow: Outgoing/Incoming Tide

  14. What are the phases of the moon?

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