Spring Tides On Earth Moon Sun Gravitation c90 Y/O Trade Ad Card

Description

Spring Tides On Earth Moon Sun Gravitation c90 Y/O Trade Ad Card
NOTE:
THESE ARE NOT POSTCARDS
THEY ARE TRADE/ADVERTISING CARDS.
THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD
AND
THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
THIS IS AN ORIGINAL c90  YEAR OLD TRADE  ADVERTISING CARD
THIS CARD SHOWS:
SPRING TIDES ON EARTH
A spring tide is a common historical term that has nothing to do with the season of spring. Rather, the
term is derived from the concept of the tide "springing forth." Spring tides occur twice each lunar month
all year long without regard to the season. Neap tides, which also occur twice a month, happen when the
sun and moon are at right angles to each other.
Tides are long-period waves that roll around the planet as the ocean is "pulled" back and forth by the
gravitational pull of the moon and the sun as these bodies interact with the Earth in their monthly and
yearly orbits.
During full or new moons-which occur when the Earth, sun, and moon are nearly in alignment-average
tidal ranges are slightly larger. This occurs twice each month. The moon appears new (dark) when it is
directly between the Earth and the sun. The moon appears full when the Earth is between the moon and
the sun. In both cases, the gravitational pull of the sun is "added" to the gravitational pull of the moon on
Earth, causing the oceans to bulge a bit more than usual. This means that high tides are a little higher and
low tides are a little lower than average.
These are called spring tides, a common historical term that has nothing to do with the season of spring.
Rather, the term is derived from the concept of the tide "springing forth." Spring tides occur twice each
lunar month all year long, without regard to the season.
NOTE:
THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT SIDE
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
NOTE:
THE IMAGE ABOVE IS LARGER THAN THE CARD
TO SHOW THE DETAIL.
SEE SCALED IMAGE ABOVE.
THIS CARDS IS NOT A MODERN REPRODUCTION
THIS CARD IS c90 YEARS OLD
IT IS NOT PERFECT AND THIS CARD MAY HAVE
SLIGHT PAPER LOSS
SMUDGING
ROUNDED CORNERS
SURFACE CREASE
SEE THE IMAGES ABOVE!
4
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BUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS
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NOTE:
ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERD
MAIL AND WILL SPLIT THE COST WITH THE BUYER.
INQUIRE IF CONCERNED!