Two-Camera UFO Analysis
<p>Fireballs and meteors are notoriously difficult for observers to describe accurately, let alone UFOs, UAPs, and other strange things seen in the sky. Distance, in particular, can be very misleading. Meteorite hunters often hear from witnesses things like “it landed just beyond that hill over there”, or “look just past that row of trees because I saw it land there”. When meteorites are finally located, they are almost always literally hundreds of miles further away from where the witnesses swore they saw them land.</p>
<p><img alt="" src="https://miro.medium.com/v2/resize:fit:630/1*dD5iEN0uaEDCoebssHrUCg.png" style="height:522px; width:700px" /></p>
<p>Fireball image courtesy NewScientist</p>
<p>UFOs and UAPs are often bizarre, literally alien-looking objects, sometimes moving with mind-numbing accelerations unlike anything in our normal experiences. Getting accurate distance perceptions can be very problematic, to say the least — even more frustrating than with meteors and fireballs.</p>
<h2>How Big Was That Object?</h2>
<p>The size of an object, that is its diameter or length, is intuitively gleaned from its perceived distance. So if the distance is misunderstood, the object’s size is just as much in doubt. Scientifically-minded UFO investigators are trained to ask for the angular size of an object, that is, how big was it compared to a common object held at arm's length, or how did its width compare to the full moon? The angular diameter of an object and its distance, if this data is accurately known, can be used to calculate an object’s actual size.</p>
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