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    unpalombaro: A Brocken spectre, also called Brocken bow or mountain spectre, is the apparently enormously magnified shadow of an observer, cast upon the upper surfaces of clouds opposite the sun. The ‘spectre’ appears when the sun shines from behind a climber who is looking down from a ridge or peak into mist. The light projects the climber’s shadow forward through the mist, often in an odd triangular shape due to perspective. The apparent magnification of size of the shadow is an optical illusion that occurs when the observer judges his shadow on relatively nearby clouds to be at the same distance as faraway land objects seen through gaps in the clouds, or when there are no reference points at all by which to judge its size. The shadow also falls on water droplets of varying distances from the eye, confusing depth perception. The ghost can appear to move (sometimes quite suddenly) because of the movement of the cloud layer. The head of the figure is often surrounded by the glowing halo-like rings of a glory, rings of coloured light that appear directly opposite the sun when sunlight is reflected by a cloud of uniformly-sized water droplets.” via the nonist

    unpalombaro:

    A Brocken spectre, also called Brocken bow or mountain spectre, is the apparently enormously magnified shadow of an observer, cast upon the upper surfaces of clouds opposite the sun.

    The ‘spectre’ appears when the sun shines from behind a climber who is looking down from a ridge or peak into mist. The light projects the climber’s shadow forward through the mist, often in an odd triangular shape due to perspective. The apparent magnification of size of the shadow is an optical illusion that occurs when the observer judges his shadow on relatively nearby clouds to be at the same distance as faraway land objects seen through gaps in the clouds, or when there are no reference points at all by which to judge its size. The shadow also falls on water droplets of varying distances from the eye, confusing depth perception. The ghost can appear to move (sometimes quite suddenly) because of the movement of the cloud layer.

    The head of the figure is often surrounded by the glowing halo-like rings of a glory, rings of coloured light that appear directly opposite the sun when sunlight is reflected by a cloud of uniformly-sized water droplets.”

    via the nonist



    Reblogged from unpalombaro.

    January 24, 2012, 10:58pm

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