WEBVTT

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HOWDY SUMMER-STARS TRACE HERE!

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IT S THE JUNE SOLSTICE, THE FIRST DAY OF
SUMMER AND THE LONGEST DAY OF THE YEAR IN

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THE NORTHERN HEMISPHERE.

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SOLSTICE COMES FROM LATIN SOL - SUN AND SISTERE
- TO STAND STILL.

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IT APPEARS TO HAPPEN BECAUSE THE EARTH WOBBLES
ON OUR AXIS -- CALLED AN AXIAL TILT -- THIS

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MEANS THE NORTHERN HEMISPHERE TILTS TOWARD
THE SUN IN JUNE, AND AWAY IN DECEMBER.

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THE AXIAL TILT IS
WHY WE HAVE SEASONS, AND NOT, LIKE SOME THINK,

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BECAUSE OF THE DISTANCE FROM EARTH TO THE
SUN.

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EARTH S TILT WAS THOUGHT TO BE CAUSED BY
A GREAT IMPACT, PERHAPS BY THEIA -- WHICH

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IS THE OBJECT THAT HIT EARTH AND SPUN OFF
TO CREATE THE MOON.

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ALL OUR PLANETS HAVE TILTS, SO EACH ONE HAS
A SOLSTICE AND SEASONS, BUT THE FURTHER OUT

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YOU ARE, THE LONGER EACH SEASON WILL BE, BY
EARTH RECKONING.

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HECK, NEPTUNE S LAST SUMMER SOLSTICE WAS
IN NINETEEN THIRTEEN.

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KEEP LOOKIN UP!