ASTRO 111 quiz
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34 Terms
ecliptic
earths plane of orbit around the sun, and annual apparent path of the sun
What causes seasons on earth
Earth’s 23.5 degree tilt affecting the intensity from the sun.
equinox
when daylight = night time, sun crosses celestial sphere
solstice
When the day/night is longest
important points of the celestial sphere
celestial pole, celestial equator, zenith and naidr
what affect does earths orbit have on the stars
stars may appear to rise and fall, or orbit polaris/central point in the sky
how does location effect what you see
depicts what falls below the horizon
Precession
wobble of the earths vertical axis
Major stars of the summer triangle
Vega, Altair, Deneb
Vega
in Lyra (Harp-orpheus), 5th brightest star
altair
in aquila (flying one, eagle) 12th brightest star
Deneb
in Cygnus (Swan, hens tail) big bright star
how to find andromeda
from Cassiopeia, east towards the diamond of Pegasus, then to Alpharatz
What is the major star of Bootes
Arcturus
how to find andromeda
east of Cassiopeia to the diamond of pegasus, Alpharatz is the most north star
What causes seasons on earth
23.5 tilt affecting the suns intensity
where sun is during solstice and equinox
Solstice: 23.5 above or below equator, equinox: above the equator
importance of axial tilt
creating seasons
order of lunar phases
new moon, waxing crescent, 1st quarter, waxing gibbous, full moon, wanning gibbous, 3rd quarter, wanning crescet
Artic circle
23.5 from the north pole
Antarctic cirlce
23.5 from the south pole
tropic of cancer
23.5 north of equator
tropic of capricorn
23.5 south of the equator
sidereal
days it takes for the moon to go around the earth 27.3
synode
days it takes for the moon to complete one cycle 29.5
solar eclipse
sun falls behind the shadow of the moon
lunar eclipse
moon falls behind the shadow of the earth
penumbra
outter shadow of earth, light partially blocked
umbra
inner central shadow, direct light completely blocked
penumbral eclipse
when moon enters penumbra
partial eclipse
when moon partially enters umbra
total eclipse
when moon fully enters umbra
why are eclipses so rare
because the perfect alignment
why are solar eclipse so short
sun is alot larger than the moon, meaning the shadow is limited