- Any atmospheric phenomenon (not including clouds) that restricts the vertical visibility or slant visibility—that is, that obscures a portion of the sky from the point of observation.
Aviation dictionary. 2014.
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Transient lunar phenomenon — A transient lunar phenomenon (TLP) or Lunar Transient Phenomena (LTP), refers to short lived lights, colors, or changes in appearance of the lunar surface. Claims of short lived phenomena go back at least 1,000 years, with some having been… … Wikipedia
eclipse — eclipser, n. /i klips /, n., v., eclipsed, eclipsing. n. 1. Astron. a. the obscuration of the light of the moon by the intervention of the earth between it and the sun (lunar eclipse) or the obscuration of the light of the sun by the intervention … Universalium
cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… … Universalium
Haze — is traditionally an atmospheric phenomenon where dust, smoke and other dry particles obscure the clarity of the sky. The WMO manual of codes includes a classification of horizontal obscuration into categories of fog, ice fog, steam fog, mist,… … Wikipedia
nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula … Universalium
Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… … Universalium
Tulpa — Part of a series on Tibetan Buddhism … Wikipedia
Alphonsus (crater) — Alphonsus crater appears in the right half of this image taken by Ranger 9. NASA photo. Coordinates … Wikipedia
Airy disk — Computer generated image of an Airy disk. The gray scale intensities have been adjusted to enhance the brightness of the outer rings of the Airy pattern … Wikipedia
Blind spot (vision) — For other uses, see Blind spot (disambiguation). Vertebrate … Wikipedia