solar system models earth centered system developed by ptolemy was accepted until the 1960’s ...
TRANSCRIPT
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SOLAR SYSTEM MODELS
EARTH CENTERED SYSTEM DEVELOPED BY PTOLEMY
WAS ACCEPTED UNTIL THE 1960’S
SUN CENTERED SYSTEM DEVELOPED BY COPERNICUS
MODERN UNDERSTANDING OF THE STRUCTURE OF THE
UNIVERSE
GEOCENTRIC
HELIOCENTRIC
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CELESTIAL OBJECTS- OBJECTS OBSERVED IN THE SKY DURING THE DAY OR NIGHT. (PLANETS, SUN, MOON, STARS…)
CONSTELLATION- A GROUP OF STARS THAT MAKE AN IDENTIFIABLE PATTERN IN THE SKY
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A SPINNING ABOUT THE NORTH AND SOUTH AXIS
ROTATION
EVIDENCE:THE APPARENT DAILY COUNTER- CLOCKWISE MOTION OF CELESTIAL OBJECTS AROUND POLARIS (NORTH STAR) IS BECAUSE OF EARTH’S ROTATION TOWARD THE EAST. (RATE = 15° PER HOUR)
SOLAR DAY- THE AMOUNT OF TIME REQUIRED FOR THE EARTH TO ROTATE FROM ONE NOON TO THE NEXT.
15° X 24 HOURS = 360°
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HORIZONTAL DEFLECTION UNDERGONE BY ALL MOVING MATERIALS ON THE EARTH’S SURFACE
CORIOLUS EFFECT
NORTHERN HEMISPHER - DEFLECTED TO THE RIGHT
(CLOCKWISE)
SOUTHERN HEMISPHERE - DEFLECTED TO THE LEFT
(COUNTER CLOCKWISE)
LET’S SHOOT SOME CANNONS!!
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FOUCAULT PENDULUM
AN EXPERIMENT TO DEMONSTRATE THE ROTATION OF THE EARTH
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A SLIGHTLY ELLIPTICAL ORBIT AROUND THE SUN (COUNTER CLOCKWISE)
365.25 DAYS FOR ONE REVOLUTION
REVOLUTION
PERIHELION - SUN IS THE LARGEST, OCCURS IN THE N.H. WINTER (SHORTEST DISTANCE BETWEEN THE EARTH & SUN)
APHELION - SMALLEST, OCCURS IN THE N.H. SUMMER (LARGEST DISTANCE BETWEEN THE EARTH & SUN)
EVIDENCE:
SEASONAL CHANGE OF THE CONSTELLATIONS
THE SOLAR DIAMETER VARIES IN A CYCLIC PATTERN
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SEASONS
THE EARTH’S TILT IS
LOCAL NOON – WHEN THE SUN REACHES ITS MAXIMUM ALTITUDE
ZENITH – THE POINT DIRECTLY OVERHEAD
**THE SUN’S RAYS CAN ONLY BE DIRECTLY OVERHEAD AT SOLAR NOON BETWEEN THE TROPICS
(23.5° N OR S OF THE EQUATOR)
23.5°
PARALLELISM OF THE EARTH’S AXIS – THE EARTH AXIS REMAINS PARALLEL THROUGHOUT ITS REVOLUTION AROUND THE SUN.
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EQUINOX – THE SUN IS IN THE ZENITH POSITION AT THE EQUATOR (MARCH 21ST AND SEPT. 23RD)
12 HOURS OF BOTH DAYLIGHT AND DARKNESS
SUMMER SOLSTICE – THE SUN IS IN THE ZENITH POSITION AT THE TROPIC OF CANCER (JUNE 21ST )
LONGEST DAYLIGHT OF THE YEAR IN THE NORTHERN HEMISPHERE
WINTER SOLSTICE – THE SUN IS IN THE ZENITH POSITION AT THE TROPIC OF CAPRICORN (DEC. 21ST)
SHORTEST DAYLIGHT OF THE YEAR IN THE NORTHERN HEMISPHERE
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Summer
Winter
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