Selenology Astronomy dictionary, letter S Selenology is a branch of astronomy and consists in the study of the composition and evolution of the Moon as a celestial body and the structures that form its surface. Selenology is synonymous with lunar geology. This is a branch of science that can have a great future if, as expected, advances in astronautics allow for a continuous and direct study of our satellite.
Albedo Dictionary of astronomy, letter A Albedo is the relationship between the intensity of the reflected light and the incident by a celestial body that does not emit its own light. It is measured with a number between 0 and 1, after it has been established that 0 is the albedo of a body that does not reflect any light and 1 is the albedo of a body that reflects all the incident light.
Algol (double star) Dictionary of astronomy, letter A Algol is a double star of the constellation of Perseus (also called b Persei), so called, of the name of an Arab demon, because it changes periodically in luminosity. Algol is 82 light years from Earth. Algol is the prototype of the Eclipse Variables, double stars in which one component periodically hides the other, causing a decrease in brightness.
Afelio Dictionary of astronomy, letter A The aphelion is the most distant point of the orbit of a planet around the Sun. It is the opposite of the Perihelion, the closest point to the Sun. As established in the second of Kepler's laws, speed The translation of the planet is minimal in the aphelion. In orbital elements it is represented with a "Q".
Algonquin (observatory) Dictionary of astronomy, letter A Algonquin is one of the most advanced research centers for radio astronomy studies. It is located in Algonquin Park, Ontario (Canada), and is equipped with a 46 m satellite dish. diameter. With this instrument, the large baseline Interferometry technique (from English Long Long Baseline Interferometry or VLBI) has been experimented, which consists in putting radio telescopes very distant from each other to obtain a high resolution power, that is, the capacity to distinguish very small details in distant celestial objects.
Love (Asteroid) Dictionary of astronomy, letter A Love is the name of an Asteroid, discovered in 1932, which grazes the Earth's orbit, however remaining outside. By extension with the name Objects Love is usually indicated a class of asteroid objects whose orbits are very close to the Earth, but that do not cross the orbit.
Ames (study center) Astronomy dictionary, letter A The Ames space study center is one of NASA's study centers, founded in 1940 in Moffet Field, California. He has taken the name of Joseph Ames, the first president of the aerospace agency that preceded the constitution of NASA and was called NACA, initials of the National Advisory Committee for Aeronautics.
Light year or light-year Dictionary of astronomy, letter A The light year or light-year is a unit of length used in astronomy to measure large distances. It is equal to the distance traveled by light in an average solar year, or more specifically, the distance a photon would travel in a vacuum at an infinite distance from any gravitational field or magnetic field, in a Julian year (365.
Altitude Astronomy dictionary, letter A Altitude is the vertical distance between a conventional reference level (such as sea level) and the point considered. Altitude is positive if the point is above the reference level and negative if it is below. ◄ Previous Next ► Altacimutal Height ABCDEFGHIJKLMNOPQRSTUVWXYZ Custom Search
Antenna Astronomy dictionary, letter A An antenna is an instrument used in electronics to propagate or receive radio or electromagnetic waves. It is essential to emit or receive radio, television, microwave, telephone and radar signals. Most antennas are made of wires or metal rods connected to the sending or receiving equipment.
Andromeda (galaxy de) Astronomy dictionary, letter A The Andromeda galaxy is a star system similar to our Galaxy, but much larger. It is estimated that its diameter is approximately 200 thousand light years, twice the Milky Way, and the number of stars it contains is around 300 billion, triple.
Hour angle Astronomy dictionary, letter A The hour angle is the angular distance measured along the celestial equator from the local meridian to the celestial meridian, which passes through the considered body. It is measured in hours, in minutes and in seconds, or in degrees of arc: positive towards the West and negative towards the East.
Alouette Astronomy Dictionary, letter A Alouette is the name of two Canadian scientific satellites built specifically to study the Ionosphere. They were launched from the United States on September 28, 1962 and November 28, 1965 respectively, within the scope of a cooperation program.
Angstrom (unit of measure) Dictionary of astronomy, letter A The Angstrom is a unit of measure equivalent to ten thousand millionth of the meter, 0.000,000,000.1 meters, whose symbol is Å, used mainly to indicate the wavelengths of visible light In an inch fit 10 million angstroms.
Agena Astronomy Dictionary, letter A Agena is a very versatile small American missile, used from 1959 as the second section of the Thor, the Atlas and the Titan for a whole series of satellite launches (for example, the Discoverer series), of lunar (Ranger, Lunar Orbiter) and interplanetary (Mariner) probes.
Apogee Dictionary of astronomy, letter A The apogee is the point of the orbit of the Moon, an artificial satellite or the trajectory of a space vehicle, which is furthest from the center of the Earth. It is the opposite of Perigee, the closest point to Earth. The ending -geo refers to the orbits around the Earth; the ending - helium to the orbits around the Sun and the ending - astronom refers to the orbits around a star.