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Ch 1-3 terms
Need to know terms from FoA
16
Astronomy
Undergraduate 2
10/05/2017

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Term
astronomical unit
Definition
distance of Earth to Sun
Term
Light year
Definition
distance that light travels in year
Term
solar system
Definition
Sun & what orbits it
Term
galaxy
Definition
collection of gas, dust, & stars orbiting a center mass
Term
Milky way
Definition
hazy band of light that circles our sky;



our galaxy
Term
zenith
Definition
point on celestial equator that is directly overhead
Term
celestial equator
Definition
our equator line "thrown out" into space
Term
precession
Definition
wobble of earth
Term
ecliptic
Definition
visible path of sun around the sky
Term
siderial (period)
Definition
period of rotation or revolution of an object, relative to stars
Term
partial eclipse
Definition
the moon's path slightly misses the sun, thus no full eclipse
Term
annular eclipse
Definition
moon's path crosses sun completely, but moon appears smaller than sun, thus no full eclipse
Term
photosphere
Definition
visible surface of sun
Term
chromosphere
Definition
2nd "layer" of sun's visibility; bright gases
Term
corona
Definition
3rd "layer" of sun's visibility; faint outer atmosphere
Term
node
Definition
when object's orbit passes through plane of another object's orbit
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