astronomical magnitude

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• Magnitude of eclipse — Not to be confused with apparent magnitude, the logarithmic scale of astronomical brightness. An annular solar eclipse has a magnitude of less than 1.0 The magnitude of eclipse or geometric magnitude is the fraction of the diameter of the… …   Wikipedia

• Astronomical distance — Astronomical distances are distances in outer space, occurring on a much larger scale than those on Earth. For instance, the distance to (Proxima Centauri), the closest star to our solar system, is about 40,000,000,000,000 kilometers.For this… …   Wikipedia

• Astronomical survey — Astronomical surveys generally involve imaging or mapping of regions of the sky using Telescopes. In the past,surveys have been usually restricted to one band of wavelengths of electromagnetic radiation (e.g. light or radio) or to measurements of …   Wikipedia

• astronomical map — Introduction       any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… …   Universalium

• Astronomical unit — This article is about unit of length. For the full system of units, see Astronomical system of units. 1 astronomical unit = SI units 149.60×10^6 km 149.60×10^9 m Astronomical units 4.8481 …   Wikipedia

• Magnitude (astronomy) — For other uses, see Magnitude (disambiguation). Magnitude is the logarithmic measure of the brightness of an object, in astronomy, measured in a specific wavelength or passband, usually in optical or near infrared wavelengths. Contents 1… …   Wikipedia

• Astronomical naming conventions — In ancient times, only the Sun and Moon, a few hundred stars and the most easily visible planets had names. Over the last few hundred years, the number of identified astronomical objects has risen from hundreds to over a billion, and more are… …   Wikipedia

• astronomical observatory —       any structure containing telescopes and auxiliary instruments with which to observe celestial objects. Observatories can be classified on the basis of the part of the electromagnetic spectrum in which they are designed to observe. The… …   Universalium

• Magnitude —    The brightness of an astronomical object. The brightest star has a magnitude of 1.4, while the faintest visible star s magnitude is 6 …   The writer's dictionary of science fiction, fantasy, horror and mythology

• astronomical — (Roget s IV) modif. 1. [Pertaining to astronomy] Syn. uranographical, uranological, cosmological, astrophotometric, astrophotographic, astrophysical, astrochemical, heavenly, celestial, cosmic, planetary, planetoidal, astral, solar, lunar,… …   English dictionary for students

• Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… …   Wikipedia