- astro-position line
- астрономическая линия положения
Englsh-Russian aviation and space dictionary. - M.: Military publishing house USSR Ministry of Defence. edited by M. Murashkevich. 1974.
astro-position line
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astronomical position line — A position line obtained by sighting a planetary body. From the geographical position, an arc is drawn which is equal to the zenith distance of the body. A tangent to this arc is the astro position line. To obtain a fix, either another astro, or… … Aviation dictionary
Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… … Wikipedia
Ley line — Ley lines are hypothetical alignments of a number of places of geographical interest, such as ancient monuments and megaliths. Their existence was suggested in 1921 by the amateur archaeologist Alfred Watkins, whose book The Old Straight Track… … Wikipedia
Binary star — For the hip hop group, see Binary Star (band). Hubble image of the … Wikipedia
Formation and evolution of the Solar System — Artist s conception of a protoplanetary disk The formation and evolution of the Solar System is estimated to have begun 4.568 billion years ago with the gravitational collapse of a small part of a giant molecular cloud … Wikipedia
Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… … Wikipedia
White dwarf — For other uses, see White dwarf (disambiguation). Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A … Wikipedia
Alpha Centauri — This article is about α Centauri . For a Centauri , see V761 Centauri. For A Centauri , see A Centauri. For other uses, see Alpha Centauri (disambiguation). Alpha Centauri A[1]/B[2] … Wikipedia
Redshift — This article is about the astronomical phenomenon. For other uses, see Redshift (disambiguation). Physical cosmology … Wikipedia
Pluto — This article is about the dwarf planet. For other uses, see Pluto (disambiguation). Pluto … Wikipedia
Methods of detecting extrasolar planets — Any planet is an extremely faint light source compared to its parent star. In addition to the intrinsic difficulty of detecting such a faint light source, the light from the parent star causes a glare that washes it out. For those reasons, only a … Wikipedia
