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Reference.org
Occulting disk
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<p>An occulting disk is a small disk placed centrally in the eyepiece of a <a href="/facts/Telescope/BDwYahhR">telescope</a> or at its focal point, to block the view of a bright object so that fainter objects can be seen more easily. </p><p>The <a href="/facts/Coronagraph/ggUUrlYY">coronagraph</a>, at its simplest, is an occulting disk in the focal plane of a <a href="/facts/Telescope/BDwYahhR">telescope</a>, or in front of the entrance <a href="/facts/Aperture/8PV11GQm">aperture</a>, that blocks out the image of the solar disk, so that the <a href="/facts/Solar_corona/W4WNqV9u">corona</a> can be seen. <a href="/facts/Starshade/38LPaXs2">Starshade</a> is one designed to fly in formation with a <a href="/facts/Space_telescope/BtI46sDX">space telescope</a> to image <a href="/facts/Exoplanet/zjfmqfUf">exoplanets</a>. </p>