Astronomy

Gibbous - like a 3/4 moon

crescent- 1/4 moon

Waxing - ↑

Waning-↓

Eclipses - a celestial body is covered up

Lunar eclipse- earth covers moon

Solar - moon covers sun

                                     cone shaped shadow

-moon's orbit is not directly in line w/ earth’s orbit

          * moon's orbit is inclined/tilted-Where moon is relative to person, time of day, phase- test q!

Options for moon = zenith, set, horizon

Tool= point right thumb north, way hand curls is direction of movement

half stars - near equator

Circumpolar stars- near pole

Both- in between

terms: gigaton-an American billion (weight of the sun)(1.9x10E30 kg)(or 1 solar mass)

-1 Mo

-stars are 0.2 MO

-luminosity: how bright a star is(energy output)

-10E-2 to 10E6LO

-time:years (10E9 year= gigayear)

-Stars in motion:

     -daily Sky motions caused by rotation

     -Greeks said heavens more the earth

     -celestial sphere:sphere that holds the Stars ( sphere rotates around the earth once every 24hrs)

     -north pole, south pole, Celestial equator

    - celestial points: North Star

    -circumpolar stars= stars that never set because they are close to the poles

   -near equator= fewer circumpolar stars

   -zenith: highest point above you

  -options for related questions on location: I'm at the equator,I'm near a pole, or in between

  -opposite of circumpolar stars=stars that rise & set

  -altitude:angle above the horizon

  -length for a star to rise and set= it depends

 -answer: Gemini -stars don't appear to move