Home > Flashcards > Print Preview
The flashcards below were created by user
on FreezingBlue Flashcards
. What would you like to do?
Greatest Eastern Elongation
For planets inside Earth's orbit, it is the furthest angular separation from the earth east of the sun.
Planet is opposite earth on the other side of the sun.
When two planets are aligned on the same side of the sun.
Precession of the moon's orbit is _________ when viewed north of the ecliptic plane.
Moon's Orbital Precession Period
Noncentral Solar Eclipses
...are partial eclipses.
You can't see a full eclipse no matter your location on earth.
Annular or Ring Eclipse
When the moon is smaller than the sun during an eclipse.
Who had the first model of the solar system?
Full moon is how much brighter than a 1st or 3rd quarter moon?
Fraction of light reflected by surface
ONLY with Superior Planets
For transit to occur...
Planet must be at node of it's orbit and at inferior conjunction
- When a planet covers a spot of sun
- ONLY with inferior planets
lie exterior to Earth's orbit
lie interior of Earth's orbit
Planets approximately follow...
Anomalistic Month Period
- time for moon to return to perigee or apogee
- = ~27.55 days
- time it takes for a lunar node to return to its original alignment with respect to the sun
- = ~346.62 days
- time between eclipse seasons
- = ~173.31 days
- = 6 lunations - 4 days
How long is the period of precession of the moon's orbit?
Conditions for an Eclipse
- Moon must be full or new
- Sun must be within +/-15 degrees of a node on the line of node
- Moon must be within 1 degree of ecliptic
Sun and moon move ______ relative to the stars
- Light from star receding is red-shifted
- Light from star approaching is blue-shifted
SO universe is expanding
One total eclispse every...
Second of arc = 1/60 arcminute = 1/3600 degree
Minute of arc = 1/60 degree
Size of Moon
Size of Sun
1 : 400
Distance to Moon
Distance to Sun
1 : 400
Total Lunar Eclipse
Moon passes entirely through umbra
Partial Lunar Eclipse
OR "partial umbra eclipse"
Part of moon passes through umbra
Penumbral Lunar Eclipse
Moon passes through penumbra
Types of Lunar Eclipses
- Penumbral Lunar Eclipse
- Partial Lunar Eclipse
- Total Lunar Eclipse
How big are the umbra and penumbra relative to each other?
- Umbra is exactly one-half radius of penumbra
Which is penumbra? umbra?
Moon moves ______ in one hour
through its own diameter
How many degrees does moon move around the earth in an hour? a day? a year?
- Hour: ~1/2 degrees
- Day: ~13.2 degrees
- Year: 360 degrees
Earth moves how many degrees around the sun each day?
Moon's Sidereal Period
OR Orbital Period
Time for the moon to return to given star on the celestial sphere
When a planetary body culminates, what happens?
It is on the meridian.
Distance to the moon is what?
30 +/- 2 Earth diameters
1st quarter Moon is at...
3rd quarter moon is at...
The moon at opposition is...
A full moon is at...
The moon at conjunction is...
The new moon is at...
- = 291/2 days
- = Synodic Period = Phase Period
time required for a planetary body to return to the same position relative to the sun
time taken for object to completely orbit around another
- =Lunation = Phase Period
- =291/2 days
Diameter of Moon
1/4(Diameter of Earth)
- or "Seasonal Year"
- Time for sun to return to vernal equinox position
- =365.242 days
Four Major Celestial Days
3 Pacesetters for Glaciation
- 1) Eccentricity of Earth's orbit
- 2) Tilt of Earth's spin axis (22.25-24.5 degrees)
- 3) Precession of Earth's spin axis
Eccentricity of earth's orbit is over period of...
Which way does Earth's spin axis precess?
Precession of Earth's Spin Axis
- the axis changes its angle relative to the sun
Precession Period of Earth's spin axis
What are cross quarter days?
The days in between the solstices and equinoxes:
- =18 years 11 days
- 234 Anomalistic Months
- time it takes for sun, earth, and moon to return to approximatey the same relative geometry
- nearly identical eclipses
Best time to see Venus is when...
it's at the farthest angular distance from the sun
when the superior planets are 90 degrees from the sun at the Earth
Sidereal Period for Planets
time to orbit the sun relative to the fixed stars
Synodic Period for Planets
- time for planet to repeat its configurations (opposition-opposition)
- "Configuration period"
What is the order of: opposition, conjunction, east quadrature, west quadrature?
W.Q., Opposition, E.Q., Conjunction
Who figured out that the planets' orbits are elipses?
Best time to look at superior planets?
When its at opposition
Why is the best time to look at a superior planet when it's at opposition?
- it's close
- it's brighter
- convenienet because on the meridian at minight
- rises sunset, sets at sunrise
When the planet stops and moves westward relative to the stars
Direct or Prograde Motion
Planet moves eastward toward larger right ascensions relative to stars
What would you like to do?
Home > Flashcards > Print Preview