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Elarth Ch 1 and 2

Celestial Sphere

QuestionAnswer
ASTRONOMICAL UNIT AVERAGE DISTANCE FROM EARTH TO THE SUN (15O,OOO,OOO km OR 93,000,000 MILES
LIGHT YEAR (LY) DISTANCE LIGHT TRAVELS IN A YEAR
CONSTELLATION (OLD) ONE OF 88 STELLAR PATTERNS IN THE SKY (USUALLY MYTHOLOGICAL ANIMALS, PEOPLE, GODS, OR OBJECTS
CONSTELLATION (NEW) THE REGIONS OF THE SKY CONTAINING THE 88 CONSTELLATIONS
ZENITH THE POINT ON THE SKY DIRECTLY OVERHEAD
NORTH CELESTIAL POLE THE POINT ON THE CELESTIAL SPHERE DIRECTLY ABOVE THE EARTH'S NORTH POLE
SOUTH CELESTIAL POLE THE POINT ON THE CELESTIAL SPHERE DIRECTLY ABOVE THE EARTH'S SOUTH POLE
PRECESSION THE SLOW CHANGE IN THE DIRECTION OF THE EARTH'S AXIS OF ROTATION, ONE CYCLE TAKES ABOUT 26,000 YEARS
ROTATION THE TURNING OF A BODY ABOUT AN AXIS THAT PASSES THROUGH IT
REVOLUTION THE MOTION OF A BODY IN A CLOSED PATH AROUND A BODY OUTSIDE OF ITS VOLUME
ECLIPTIC THE APPARENT PATH OF THE SUN AROUND THE SKY
VERNAL EQUINOX ONE OF 2 PLACES WHERE THE ECLIPTIC AND THE CELESTIAL EQUATOR CROSS. ABOUT MARCH 21, BEGINNING OF SPRING
SUMMER SOLSTICE POINT ON THE CELESTIAL SPHERE WHERE THE SUN IS AT ITS MOST NORTHERN. BEGINNING OF SUMMER, ABOUT JUNE 22
CELESTIAL EQUATOR IMAGINARY LINE AROUND THE SKY DIRECTLY ABOVE THE EARTH'S EQUATOR
AUTUMNAL EQUINOX ONE OF 2 PLACES WHERE THE ECLIPTIC AND THE CELESTIAL EQUATOR CROSS. ABOUT SEPT 22, BEGINNING OF FALL
ANGULAR DIAMETER MEASURE OF THE SIZE OF AN OBJECT IN THE SKY
PERIHELION THE POINT WHEN AN OBJECT IS CLOSEST TO THE SUN
APHELION THE POINT AT WHICH AN OBJECT IS FARTHEST FROM THE SUN
CIRCUMPOLAR ANY CONSTELLATION SO CLOSE TO THE POLE IT DOESN'T SET
ALTITUDE DEGREES ABOVE THE HORIZON
AZIMUTH DEGREE MEASUREMENT, BEGINNING AT NORTH, FOLLOWING THE HORIZON THROUGH EAST
Created by: elarthju
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