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52 Cards in this Set

  • Front
  • Back
What is astronomy?
The study of the physical universe
What is a scientific attitude?
Knowing that science changes based on current information
AU
Astronomical Unit
-distance from earth to sun
-useful for solar system distances
ly
Light Year
useful for stellar distances
pc
Parsec
3ly
useful for stellar distances
Mpc
Mega parsec
3.26million ly
useful for galactic distances
Mercury to Sun distance
0.4AU
Venus to Sun distance
0.7AU
Mars to Sun distance
1.5AU
Jupiter to Sun distance
5AU
Saturn to Sun distance
10AU
Uranus to Sun distance
20AU
Neptune to Sun distance
30AU
Pluto to Sun distance
40AU
Naked Eye Sky
6,000 stars
5 Planets
Sun and Moon
How many official constellations are there?
88, made with lines of celestial longitude and latitude
Body Part Angles-fist
10 degrees
Thumb
2 degrees
Pinky
1 degree
1 degree=
60 arc minutes
Diurnal star motion
due to Earth's rotation
east-west
How much earlier do stars rise each night?
4 minutes
Diurnal Sun motion
due to earth's rotation
east-west
Sidereal sun motion
due to earths revolution
west-east
Ecliptic
path of sun in celestial field
Highest Point in ecliptic
Summer Solstice
Lowest Point in Ecliptic
Winter Solstice
Middle Points
Vernal/Autumnal Equinox
Precession
wobble due to the sun and the moon pulling on the equator
Noticiable precession changes
Pole star changes
Diurnal Motion of the moon
due to Earth's rotation
East to West
Moon's sidereal motion
due to moons revolution
west to east
takes 27.3 days-13 degrees per day
Moons synodic period
29.5 days relative to the sun
Darkest part of shadow
Umbra
Lighter part of shadow
Penumbra
Solar Eclipse
Moon is in new phase
Moon on the ecliptic
Lunar Eclipse
Moon is in full phase
Moon is on ecliptic
Diurnal Motion of the planets
Due to earths rotation
East to west
Sidereal motion of planets
west to east or
east to west (retrograde)
Inner Planet between the Sun and Earth
inferior conjunction
Sun between Earth and inner planet
superior conjunction
Maximum angle away from sun in our sky
Greatest Elongation
Earth between outer planet and sun
Opposition
Aristotle
Universe is geocentric
Doesn't explain retrograde
Ptolmey
Adds epicycles to Aristotle's universe
Copernicus
Heliocentric universe in perfect circles
inner planets faster than outer
retrograde due to inner planets passing outer planets
Brahe
measured planets to high accuracy for 20 years
built large instruments
Kepler
3 Laws of Planetary Motion
Law One
planets orbit in an elipse with the sun at one focus
Law Two
a planet-sun line sweeps out equal areas in equal intervals of time
Law Three
P years squared=Semi-major axis AU's cubed
P=time to complete one orbit
A=avg. planet sun distace
Galileo
Telescopic observations
Discovered jupiters 4 moons
Phases of venus proved heliocentrism