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TIME: Almanac 1995
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TIME Almanac 1995.iso
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1995-02-26
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<text id=92TT2271>
<title>
Oct. 12, 1992: Where Have You Been?
</title>
<history>
TIME--The Weekly Newsmagazine--1992
Oct. 12, 1992 Perot:HE'S BACK!
</history>
<article>
<source>Time Magazine</source>
<hdr>
THE WEEK, Page 33
HEALTH & SCIENCE
Where Have You Been?
</hdr><body>
<p>Late by about a decade, a missing comet finally streaks into
view
</p>
<p> Every August, comet Swift-Tuttle leaves a spectacular calling
card. The trail of dust it sheds on its journey around the sun
intersects Earth's orbit and flares into the Perseid meteor
shower. The comet itself last appeared in 1862, and based on the
orbit calculated at that time, it should have showed up again
between 1979 and 1983. It didn't.
</p>
<p> But last week a Japanese comet hunter spotted a faint blob
through powerful binoculars, and a check of its orbit confirmed
that Swift-Tuttle had come back at last (it may be barely
visible to the naked eye in November). Why so late? A comet's
orbit is determined only by careful plotting of its position
when it's visible; evidently the 1862 measurements were off. To
his credit, Brian Marsden, of the Harvard-Smithsonian Center
for Astrophysics, had argued in a 1973 paper that Swift-Tuttle
might be late. Few astronomers paid attention -- but Marsden's
prediction was only 17 days off.
</p>
</body></article>
</text>