Rotation
What is rotation?
the spinning of earth on it's axis
What is revolution?
earth orbiting the sun
What is the tilt of earth's axis?
23.5 degrees
What is a star?
What is Gravity?
attractional force between objects
What does rotation give us?
Day and night
What does revolution give us?
The year.
What does earth's axial tilt give us?
Seasons
What fuels a star?
What causes the tides?
the moons gravity
What is Earth's rate of rotation?
15 degrees per hour
What is Earths rate of revolution?
1 degree per day
What is the Aphelion
during nuclear fusion what happens?
lighter elements become heavier
What is eccentricity?
How oval a planet's orbit is
What star does not seem to move in the night sky?
Polaris
What is the shape of earth's orbit around the sun?
an ellipse (oval)
when is the summer solstice?
June 21
How many days is the sun directly overhead?
zero
how do you increase eccentricity?
increase the distance between the two foci
What is evidence of rotation?
coriolis effect and Foucault's pendulum
Why do we see different constellations during different seasons?
revolution
What season is it in the northern hemisphere when the earth is at the aphelion?
summer
How does a star form?
gravity causes a nebula to collapse. When there is enough mass nuclear fusion occurs igniting the star.
What is the heliocentric model? What is the geocentric model?
Heliocentric model is the sun in the center of the solar system. Geocentric model is the earth in the center of the universe/solar system.