moon, tides, and seasons Flashcards

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0
Q

what unit of measurement is best for astronomical distant?

A

Light Years

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1
Q

the HR-diagram plots ____1)____ versus ___2)___ magnitude

A

1) temperature (kelvin)

2) absolute

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2
Q

In scientific experiments, you have an independent axis X, and a dependent axis T, what part of the experiment never changes?, the ______

A

constant (or control)

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3
Q

what is the earth’s axis tilt?

A

23.5 degrees

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4
Q

because of the earths axil tilt, we experience 4 distinct _____?

A

seasons

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5
Q

what occurs on June 22nd?

A

the summer solstice

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6
Q

what occurs on September 22nd?

A

autumnal equinox

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7
Q

what occurs on December 22nd?

A

winter solstice?

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8
Q

what occurs on March 22nd?

A

vernal equinox

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9
Q

because of the solstices and equinoxes, we occur different lengths of _____.

A

day light

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10
Q

what is the earth rotational period?

A

24 hours

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11
Q

what is the earths revolution period?

A

365.25 days

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12
Q

how many earth days are one lunar day?

A

28

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13
Q

a planet does this on its axis __1)__ and does this around the Sun __2)__.

A

1) rotates

2) revolves

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14
Q

mechanical waves need a ______ to travel

A

medium

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15
Q

where does the moon get its light from?

A

the sun. it reflects like a mirror

16
Q

REMEMBER THE PHASES OF THE MOON CAUSE THERE ARE GONNA BE A LOT OF THEM ON THE TEST

A

DON’T FORGET

17
Q

how many tides are there in one day?

A

2 ebbs
2 flows

18
Q

each tide is how many hours apart?

A

6

19
Q

describe the alignment of the earth moon and sun in a spring tide.

A

when the moon, earth and sun are in a straight line.

20
Q

describe the alignment of the earth moon and sun in a neap tide.

A

when the moon, earth and sun are at 90 degrees

21
Q

what is the moon mostly made out of?

A

basalt

22
Q

the moon is _________ years old

A

4 billion

23
Q

what is perigee

A

when a celestial body is at its closest point

24
Q

what is apogee

A

when a celestial body is at its farthest point

25
Q

a gibbous moon is when we see … ?

A

3/4 of the lunar disc

26
Q

what are the 3 things in the milankovich cycle?

A

1) the angle that the earths axis is tilted at
2) the axial precession
3) the shape of the orbital path