moon, tides, and seasons Flashcards
what unit of measurement is best for astronomical distant?
Light Years
the HR-diagram plots ____1)____ versus ___2)___ magnitude
1) temperature (kelvin)
2) absolute
In scientific experiments, you have an independent axis X, and a dependent axis T, what part of the experiment never changes?, the ______
constant (or control)
what is the earth’s axis tilt?
23.5 degrees
because of the earths axil tilt, we experience 4 distinct _____?
seasons
what occurs on June 22nd?
the summer solstice
what occurs on September 22nd?
autumnal equinox
what occurs on December 22nd?
winter solstice?
what occurs on March 22nd?
vernal equinox
because of the solstices and equinoxes, we occur different lengths of _____.
day light
what is the earth rotational period?
24 hours
what is the earths revolution period?
365.25 days
how many earth days are one lunar day?
28
a planet does this on its axis __1)__ and does this around the Sun __2)__.
1) rotates
2) revolves
mechanical waves need a ______ to travel
medium
where does the moon get its light from?
the sun. it reflects like a mirror
REMEMBER THE PHASES OF THE MOON CAUSE THERE ARE GONNA BE A LOT OF THEM ON THE TEST
DON’T FORGET
how many tides are there in one day?
2 ebbs
2 flows
each tide is how many hours apart?
6
describe the alignment of the earth moon and sun in a spring tide.
when the moon, earth and sun are in a straight line.
describe the alignment of the earth moon and sun in a neap tide.
when the moon, earth and sun are at 90 degrees
what is the moon mostly made out of?
basalt
the moon is _________ years old
4 billion
what is perigee
when a celestial body is at its closest point
