Vocabulary
the spinning motion of the Earth on its axis
rotation
What motion is responsible for day and night?
Earth's rotation on its axis
What is apparent motion?
an optical illusion that occurs when objects appear as if they are moving due to our own motion
The imaginary line that runs through the center of the Earth
axis
Which motion is responsible for a 365 day year?
Earth's revolution around the sun
What motion is responsible for a shadow's change throughout the day?
Earth's rotation on its axis
the motion of one planet or celestial object around another
revolution
The sun appears to move in which direction across the sky?
East to West
What causes a shadow to change throughout the year?
Earth's revolution around the Sun
the Eastern/Western or Northern/Southern half of the planet
hemisphere
How long does it take for Earth to make one rotation on its axis?
About 24 hours
Will a shadow change more throughout the year or throughout the day?
The shadow of an object will change slightly throughout the year, but throughout the day it will change more drastically.
Define sundial
an instrument showing the time by the shadow of a pointer
If it is 9:00 a.m. in the United States, what time are fishermen in the Indian Ocean (the exact opposite side of the US) experiencing?
9:00 p.m.
If you traced the shadow of an object every day at the same time for a year, would the shadow always look the same?
It would not look the same.