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49 Cards in this Set
- Front
- Back
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Rotation
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The turning of a body on its axis
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Revolution
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Te motion o a body around a point outside the body
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Ecliptic
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Te apparent path of the sun against the background of stars
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Evening star
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any planet visible in the evening sky
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morning star
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any planet visible shortly before sunrise
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Vernal equinox
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The point where the sun crosses the celestial equator going up
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Summer solstice
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The sun is at it's farthest north
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Autumnal equinox
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the point where the sun crosses the celestial equator going down
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winter solstice
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most southern point
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Perihelion
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earth is at it's closest point to the sun
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Apehelion
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The earth is at it's most distant point from the sun
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Zodiac
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constellations on ecliptic
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Milankovitch hypothesis
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that small changes in earths orbit precession and inclination affects the earth's climate and can cause ice ages.
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scientific notation
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Raise # to power o 10. Makes large and small numbers easier to read
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distance to the sun
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1 AU or 150,000,000 km
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milky way
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cloudy band of stars
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distance units
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Meter, kilometer,AU, LY
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scaling
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proportion between distance
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Light years
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distance light travels in a year
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solar system
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MVEMJSUN
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Galaxy
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tons of stars and some planets
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cluster
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group of galaxies, biggest objects in the universe
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planet
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small spherical non luminous bodies that orbit a star and sine by reflected light
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star
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self luminous ball o as that generates its own energy
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polaris
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North star, located in ursa minor
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Horizon
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level land, limited by what you can see
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celestial equator
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just an extention of the equator
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Zenith
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Marks sky above the head
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Nadir
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Marks the underneath
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Angular diameter
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measures the size in angles
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circupolar constellation
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constellations tat only go around in a circle, tend to be more northern or southern
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asterism
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a small group of stars that go by a different name. Ex. Big dipper.
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magnitude
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brightness of a star. Apparent visual magnitude 0-6
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constellation
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grouping of stars 88 constellations
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latitude
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spherical angle amulating from the earth
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Perigee
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closest approach to Earth
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Apogee
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Furthest approach to earth
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synodic period
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moons orbit with consideration of the sun moving too. 29.53 days
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Sidereal Period
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27.32 days. Moon's orbit of earth
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Umbra
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reion of total shadow
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Panumbra
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partial shadow
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total eclipse
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moon covers entire sun
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annular eclipse
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does not cover completely
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lunar eclipse
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earth puts shadow on moon (red shade)
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solar eclipse
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moon casts it's shadow on the sun (18 years)
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saro cycle
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pattern in prediction of eclipses
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refraction
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light bending
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chromospere
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moon covers the photosphere, you see higher layer of sun's atmosphere.
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Photosphere
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outer layer of the sun
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