Word: circularity
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Dates: during 1960-1969
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...carefully measuring their apparent movement, scientists have determined that the North and South poles-the points at which the imaginary axis of rotation pierces the earth's surface-are continually on the move. Over the course of a year, they wander about the polar regions in roughly circular paths about 50 ft. in diameter...
Analyzing data at the University of Western Ontario, Geophysicists Lula Mansinha and Douglas Smylie found that the circular path traced by the North Pole between 1957 and 1968 was actually composed of interrupted arcs that spiraled almost imperceptibly inward. The inward motion, they decided, was an indication that the earth's wobble had begun to decrease for short periods of time. But between each of the arcs comprising the circle there was a break, marking a time when the wobble suddenly increased. Significantly, Mansinha and Smylie reported in Science, nearly all of the breaks occurred at the time...
...service propulsion system) engine will be fired for 246 sec. to slow the spacecraft and allow it to be pulled by the moon into a 70-by 196-mile elliptical lunar orbit. Two revolutions later, a brief 10-sec. burn will change the path to a 70-mi.-high circular orbit. Traveling at 3,640 m.p.h., Apollo will circle the moon once every two hours. For 45 nerve-racking minutes during every revolution-when it is behind the moon and blocked from radio communication with the earth-it will be out of touch with ground controllers...
Coperthwaite built the circular wooden structure on University property near Larsen Hall at a cost of about $450. Ed School students who plan to take non-credit craft courses in the building are helping Coperthwaite finance the project...
...with another $300.000 to produce the new tool. The Dymo labeler now comes in 20 models priced from $2.95 to $125 in a choice of 21 languages, including Greek and Japanese, and with tapes in 26 different colors. Most models resemble a hand gun, and all have a circular dial with letters and numbers. The user dials his choice, then squeezes the trigger. Out ticks the adhesive tape, ready for use on hundreds of items, from mailboxes to children's toys to underground cables...