Kaplan filter
https://plus.maths.org/content/category/tags/kaplan-filter
enUnderstanding the unseen
https://plus.maths.org/content/understanding-unseen
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Adam Kucharski </div>
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<img class="imagefield imagefield-field_abs_img" width="100" height="100" alt="" src="https://plus.maths.org/content/sites/plus.maths.org/files/abstractpics/5/10_sep_2012_-_1559/ixon.jpg?1347289187" /> </div>
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<p>When NASA first decided to put a man on the Moon they had a problem: once the Apollo spacecraft was in flight, they would not be able to observe its exact location and neither would they be able to predict it using physics. How could they send astronauts to the Moon if they didn't know where they were? An ingenious mathematician came up with an answer.</p>
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<div class="rightimage" style="width: 300px"><img src="https://plus.maths.org/content/sites/plus.maths.org/files/articles/2012/filters/apollo.jpg" alt="Apollo" width="300" height="277" />
<p>Hide and seek: Tracking the Apollo spacecraft was a challenge for NASA scientists.</p><p><a href="https://plus.maths.org/content/understanding-unseen" target="_blank">read more</a></p>https://plus.maths.org/content/understanding-unseen#commentsepidemiologyKaplan filtermedicine and healthNASAspace explorationThu, 11 Oct 2012 08:58:33 +0000mf3445778 at https://plus.maths.org/content