Chapter 19 - Astronomy Study Guide Flashcards
(29 cards)
What is the term for the earth spinning on its axis?
earth’s rotation
What is the term for the earth moving around the sun?
earth’s revolution
How long does it take the Earth to complete rotation?
24 hours or one day
How long does it take the earth to rotate during one revolution?
365 1/4 times
Why does the earth have daytime and nighttime?
Earth’s rotation; the sun only lights half the earth at a time
What is the term for the path Earth takes as it revolves around the sun?
Earth’s orbit
How long is Earth’s orbit?
365 1/4 days or 1 year
Why does the Earth have seasons?
Earth is tilted on its axis as it revolves around the sun.
Which hemisphere do we live in?
northern hemisphere?
How can we tell which season the Earth is in?
By viewing the earth’s tilt.
If the northern hemisphere is tilted toward the sun which season will it be experiencing?
summer
If the northern hemisphere is experiencing summer which season will the southern hemisphere be experiencing?
Winter (the hemispheres are always opposite)
If neither hemisphere is tilted toward the sun which season(s) will they be experiencing?
Spring & Fall
If the southern hemisphere is experiencing fall which season will the northern hemisphere be experiencing?
Spring
Which day of the year has the most amount of daylight?
Summer solstice
Which day of the year has the least amount of daylight?
Winter solstice
Which days of the year have an equal amount of daylight and night?
equinoxes
During which months does the summer solstice occur?
June
During which month does the winter solstice occur?
December
During which month does the vernal equinox occur?
March
During which month does the autumnal equinox occur?
September
Where does the moon get its light?
It reflects the light from the sun.
How much of the moon is always lit by the sun?
Half
Why does the moon appear to change shape?
The moon revolves around the Earth and we can only see part of the lit side of the moon
