Why does Earth seem to be standing still?



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Why does Earth seem to be standing still?

  • Because you move along with it.
  • Earth moves slowly and steadily.

What are 2 clues that Earth moves?

  • Stars seem to move across the sky.
  • The seasons change.
    • Seasons change during the year because Earth is tilted on its axis and it orbits the sun.

What causes day and night?

  • When a place on Earth is turned toward the sun it is day.
  • When a place on Earth is turned away from the sun it is night.
  • Earth rotates from west to east.

Earth’s Revolution

  • A complete trip around the sun is one revolution.
  • Earth takes 1 year or about 365 days to complete one revolution.
  • As Earth orbits the sun, its distance from the sun changes.
  • Gravity between the Sun and Earth keeps Earth revolving.
  • Without gravity, Earth would fly off into space.

Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?

What causes Earth’s seasons?

  • Earth’s axis is tilted so that the end tilting toward the sun has Spring and Summer. The end tilted away from the sun has Winter and Fall.
  • Earth revolves around the sun resulting in Earth’s axis being tilted toward the sun 1/2 the year and away from the sun the other ½ of the year.

Moon Phases

  • The changing phases of the Moon depend upon the positions of the Sun, Moon, and Stars.
  • The Moon rotates once on its axis at about the same rate that it revolves once around Earth.
  • Different amounts of the lighted half of the Moon facing the Earth causes the apparent changes of the Moon’s shape.

Eclipses

  • An eclipse occurs when one object in space comes between the Sun and another object.
  • Lunar and solar eclipses can be seen from Earth.
  • A solar eclipse occurs when the Moon, Sun, and Earth are in-line with each other.
  • In a lunar eclipse the Moon passes through Earth’s shadow.

Stars

  • The Sun is a medium-sized star close to the Earth.
  • All stars, including the Sun, are hot balls of gas.
  • Apparent patterns of stars are called constellations.
  • Distance between the stars seem close together, but they are actually far apart.

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