Panchromatic – sensitive to light of all colors in the visible spectrum.Īpogee is the point in the orbit of an object (moon, satellite, etc…) orbiting the earth that is at the greatest distance from the center of the earth.Īpparent magnitude is the measure of brightness of a celestial body as seen from Earth as seen without atmosphere.Īpparition is the appearance or time when a comet is visible such as Halley’s Comet.Īrcheoastronomy, the study of how people of the past “understand phenomena in the sky and how those phenomena affect their cultures.” Branch of archaeology that deals with use by prehistoric civilizations of astronomical techniques to establish seasons or cycle of the year, as evidenced in megaliths and other ritual structures.ĪrcMinute is a unit of angular distance equal to a 60 th of a degree.ĪrcSecond a 60 th part of a minute of an arcminute.Īsterism is a group of starts. Diameter of the objective of a telescope.Īphelion is the point of orbit of a planet or comet which is farthest away from the sun. Hypothetically a type of matter identical to physical matter except that the atoms are made of: anti-electrons, anti-protons, and anti-neutrons.Īperture is a hole, gap, or slit and any other small opening. When Sun and Moon are exactly in line, because the Moon is smaller, the Sun appears as a bright ring (annulus) surrounding the moon.Īntimatter is matter composed of anti-particles: antiprotons, antineutrons, and positrons. The property of being anisotropic and having a different value when measured in different directions.Īnnular eclipse, a solar eclipse in which the moon covers all but the bright ring around the circumference of the sun. It is a measure of how large an object actually appears to be.Īnisotropy is the state of being directionally dependent. In astronomy the angular distance of a heavenly body above the horizon.Īnaglyph is a composite picture printed in two colors to produce a 3D image viewed through eye glasses having lenses of the same colors.Īndromeda galaxy is a spiral galaxy that is nearly two and a half million light years away in the constellation Andromeda.Īngular size is the angle between two lines of sight to its two opposite sides. It is the ratio of total-reflected light.Īltazimuth mount is a two-axis mount used to support and rotate an instrument in two common perpendicular axes, vertical (altitude) and horizontal (azimuth).Īltitude is the height of anything above given a planetary reference plane. It is used to remove atmospheric distortion through the use of astronomical telescopes and laser communication.Īiry disk – Named after George Airy, it is the central spot in a diffraction pattern of a stars image in focus in a telescope.Īlbedo is the ratio that light is reflected by a planet or satellite to that received by it. As the name suggests, it works by “actively” adjusting the telescope mirrors.Īdaptive optics – technology used to improve performance of optical systems through the reduction of rapidly changing optical distortion. The construction enables telescopes to move 8 meter primary mirrors. It is a class of galaxies that emit a large amount of energy from their center more than ordinary galaxies.Īctive optics – Technology developed in the 80’s for reflecting telescopes. Achromatic lenses are used to take chromatic aberrations away from images.Īctive galactic nucleiis a region in the center of a galaxy that has a higher than normal brightness. These bring two wavelengths into focus (normally red & blue) on the same plane. There are two places astronomers find accretion disks, binary star systems and galactic nuclei.Īchromatic lens is a combination of lenses made of different glass. It is the theoretical temperature entropy reaches its minimum value.Ībsorption lines are a dark feature in the spectrum of a star formed by cooler gases in a star’s outer layer.Īccretion disks arise when material, usually gases, are transferred from one celestial object to another. The following are terms from A-Z related to space & astronomy:Ībsolute magnitude – also known as absolute visual magnitude, relates to measuring a heavenly object’s brightness when viewed from 10 parsec or 32+ light years.Ībsolute zero – The international community agreed to define absolute zero as equivalent to −273.15☌ on the Celsius scale or−459.67☏ on the Fahrenheit scale. If you ever wonder the meaning of an astronomical word, search no further and browse below to find the definition of the space term.
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