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Astronomy Review
an astronomy review for eighth graders
23
Astronomy
8th Grade
12/15/2010

Additional Astronomy Flashcards

 


 

Cards

Term
define rotation
Definition
the spinning motion of a plant on its axis
Term
define revolution
Definition
the movement of an object around another object
Term
give two reasons the earth has seasons
Definition

tilt of the axis(23.5)

revolution

Term
what is a direct sun ray
Definition
a ray of sun that is vertical and shineing directly on you
Term
what is an indirect sun ray
Definition
when the light is more horisontal (this cast a longer shadow)
Term
why does the earth have direct and indirect sun
Definition
because of the tilt (axis) of the earth
Term
when does north america have direct sun
Definition
never, but the most direct sun is in the summer
Term
when does north america have indirect sun rays?
Definition
winter
Term

how would the axis be tilted when we have short days?

what season would this be?

Definition
away, winter
Term
how would the earth be tilted when we have longer days
Definition
toward the sun
Term
what season do we have longer days?
Definition
summer
Term
what is a solar path
Definition
a path that the sun follows in  the sky
Term
what would the solar path be like in the summer, winter, spring, and fall?
Definition

summer- N.E. to N.W.

winter-S.E. to S.W.

spring to fall- E. to W.

Term
what is an equinox
Definition
equal day and night
Term
what is a solstice
Definition
the day when to sun reaches its highest and lowest point in the sky
Term
what two forces keep the planets in orbit around the sun?
Definition
gravity and inertia
Term
define gravity
Definition
the attractive forces between two things
Term
the strength of gravity depends upon what?
Definition
mass and distance
Term
define inertia
Definition
an objects tendancy to restit change
Term
when is the sun the highest in the sky in north america
Definition
summer or june 21st
Term
when is the sun the lowest in the sky in north america?
Definition
winter, december 21st
Term
what causes leap years
Definition
the 1/4 day
Term
how many days are in a year
Definition
365 1/4 days
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