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15 Cards in this Set

  • Front
  • Back
solar day
time from one noon until the next
sidereal day
relative to stars
lasts 23 hours, 56 min and 4 seconds to rotate
due to tilt of earth's axis, not relative distance to sun
Earth's tilt
longer days in summer, shorter days in winter
directness of sun's rays over time
legnth of day
when northern hemisphere is tilted towards sun and sun is north of celestial equator, more than half of small circle is above horizon--> sun is up for more than half the day
position of sun
when sun is north of celestial equator, rises north of east and sets north of west.

when sun is south of celestial equator, rises south of east and sets south of west.

rises due east and sets due west when sun is on celestial equator (twice a year)
position of sun
changes over course of year
path of sun in sky @ noon= analemma
phases relative to positions of Earth, moon and sun
@ every position, half is illuminated, but not the amount we see

New moon=see nothing
New to full=waxing
full to new=waning
waxing vs. waning
in northern hemisphere, right=waxing phase
left=waning phase
Lunar eclipse
Moon passing thru the Earth's shadow; full moon phase, lasts for ~1 hour, half the earth can see
types of lunar eclipse
Total: entire moon passes thru the umbra (total shadow)
Partial: past of moon passes thru the umbra, part thru the penumbra (partial shadow)

red b/c atmosphere refracts light as it passes thru and scatters away blue light; red light cruves around earth
Solar Eclipse
Earth passing thru the Moon's shadow, lasts for minutes, need to be on specific part of Earth
Types of solar eclipse
Total: Moon completely blocks the sun
Partial: Moon blocks only part of sun
Annular: Moon doesnt competely cover sun, at farthest point
Annular eclipse?
b/c moon's orbit is slightly elliptical (not completely circular), moon appears smaller @ apogee than when @ perigee.

when moon is farther from Earth during eclipse, doesnt completely block sun
Sidereal month= 1 rotation relative to background stars

Synodic month=1 rotation relative to Sun (1 lunar cycle)