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astronomy > quiz 2 > Flashcards

quiz 2 Flashcards

1
Q

what is declination

A

latitude, + & -

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2
Q

what is right ascension

A

longitude, hours & minutes

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3
Q

Vernal equinox Dec & RA

A

0° and 0h

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4
Q

summer solstice Dec and RA

A

23.5°+ and 6h

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5
Q

autumnal equinox Dec and RA

A

0° and 12h

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6
Q

winter solstice Dec and RA

A

23.5°- and 18h

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7
Q

how many days does it take sun to go around ecliptic

A

365.24

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8
Q

Julian calendar

A

12m 365.25 days, 1 day every 4 years

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9
Q

gregorian calendar

A

12m 365.24 days, only century years divisible by 400 are leap years

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10
Q

how long are moon phases

A

29.5 days

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11
Q

Greenwich to mi time

A

UT = EST + 5hrs

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12
Q

why do we see moon phases

A

because moon revolves around the earth

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13
Q

does the moon rise at the same time every day

A

50 min later (12°) due to E orbit

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14
Q

what is earth shine

A

when the dark side of the moon is slightly lit up by the sun’s light reflection off of earth

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15
Q

blue moon

A

2nd full moon in one month, happens every couple years

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16
Q

harvest moon

A

full moon closest to autumnal equinox

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17
Q

hunters moon

A

full moon after harvest moon

18
Q

scintillation

A

a star will appear to dance around, wink on and off, and change colors

19
Q

synodic month

A

29.5 days new moon to new moon

20
Q

sidereal month

A

27.3 days true rotational/orbital period

21
Q

apogee

A

moon is farthest from earth

22
Q

perigee

A

moon is closest to earth

23
Q

phases in order

A

new moon, waxing: crescent, quarter, gibbons, full moon, waning: gibbons quarter, crescent

24
Q

geocentric

A

earth centered

25
Q

celestial poles

A

as earth rotates around axis the sky moves the opposite way around this

26
Q

celestial equator

A

lies halfway between poles 0°

27
Q

circumpolar zone

A

stars that never set

28
Q

ecliptic

A

the path the sun appears to take around the celestial sphere each year, 23.5° above celestial equator

29
Q

wandering stars

A

planet

30
Q

zodiac

A

narrow 18° wide belt (centered on ecliptic) that the planets are found within

31
Q

apparent solar day

A

time reckoned by actual position of sun in the sky

32
Q

mean solar time

A

based on average value of solar day over the course of the year

33
Q

when was us divided in 4 timezones

A

1883

34
Q

when was the world using 24 timezones

A

1900

35
Q

synchronous rotation

A

moon faces us with the same side

36
Q

prolate spheroid

A

football shape that the earth is slightly like

37
Q

spring tides

A

higher

38
Q

neap tides

A

lower

39
Q

umbra

A

earths shadow is darkest

40
Q

penumbra

A

earth’s shadow is lighter

41
Q

annular eclipse

A

ring of light around sphere

42
Q

corona

A

sun’s outer atmosphere

astronomy (12 decks)

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