| NOUN | cognition | uranology, astronomy | the branch of physics that studies celestial bodies and the universe as a whole |
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| Meaning | The branch of physics that studies celestial bodies and the universe as a whole. | |
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| Synonym | astronomy | |
| Category of | Copernican system | (astronomy) Copernicus' astronomical model in which the Earth rotates around the sun |
| Hubble's law, Hubble law | (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer | |
| Kepler's law, Kepler's law of planetary motion | (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler | |
| Oort cloud | (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto | |
| Ptolemaic system | (astronomy) Ptolemy's model of the universe with the Earth at the center | |
| absolute magnitude | (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth | |
| accretion | (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases | |
| active | (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions | |
| anomaly | (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun) | |
| apoapsis, point of apoapsis | (astronomy) the point in an orbit farthest from the body being orbited | |
| ascension | (astronomy) the rising of a star above the horizon | |
| asterism | (astronomy) a cluster of stars (or a small constellation) | |
| astronomer, uranologist, stargazer | A physicist who studies astronomy | |
| autumnal equinox | (astronomy) the equinoctial point that lies in the constellation of Virgo | |
| barycenter | (astronomy) the common center of mass around which two or more bodies revolve | |
| canal | (astronomy) an indistinct surface feature of Mars once thought to be a system of channels | |
| coma | (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet | |
| comet | (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit | |
| conjunction, alignment | (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac | |
| culmination | (astronomy) a heavenly body's highest celestial point above an observer's horizon | |
| declination, celestial latitude, dec | (astronomy) the angular distance of a celestial body north or to the south of the celestial equator | |
| direct | Moving from west to east on the celestial sphere | |
| egress, emersion | (astronomy) the reappearance of a celestial body after an eclipse | |
| epoch, date of reference | (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded | |
| equinoctial point, equinox | (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic | |
| galaxy, extragalactic nebula | (astronomy) a collection of star systems | |
| hour angle, HA | (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing | |
| inclination, inclination of an orbit | (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees | |
| inferior | Having an orbit between the sun and the Earth's orbit | |
| inferior conjunction | (astronomy) the alignment of the Earth and a planet on the same side of the sun | |
| ingress, immersion | (astronomy) the disappearance of a celestial body prior to an eclipse | |
| libration | (astronomy) a real or apparent slow oscillation of a moon or satellite | |
| limb | (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet | |
| mean time, mean solar time | (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator) | |
| meteoroid, meteor | (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | |
| nebular, nebulous | Of or relating to or resembling a nebula | |
| node | (astronomy) a point where an orbit crosses a plane | |
| nucleosynthesis | (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom | |
| nucleus | (astronomy) the center of the head of a comet | |
| orbital plane | (astronomy) the plane on which a body is orbiting | |
| outer planet | (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto) | |
| periapsis, point of periapsis | (astronomy) the point in an orbit closest to the body being orbited | |
| phase | (astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun) | |
| planet, major planet | (astronomy) any of the nine large / large celestial bodies in the solar system that revolve around the sun and shine by reflected light | |
| primary | (astronomy) a celestial body (especially a star) relative to other objects in orbit around it | |
| quiet | Of the sun characterized by a low level of surface phenomena like sunspots e.g. | |
| red shift, redshift | (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum) | |
| retrograde | Moving from east to west on the celestial sphere | |
| right ascension, RA, celestial longitude | (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky | |
| rise, come up, uprise, ascend | come up, of celestial bodies | |
| set, go down, go under | disappear beyond the horizon | |
| star | (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior | |
| stargaze | observe / observe the stars | |
| superior | Having an orbit farther from the sun than the Earth's orbit | |
| superior conjunction | (astronomy) the alignment of the Earth and a planet on the opposite side of the sun | |
| terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time | (astronomy) a measure of time defined by Earth's orbital motion | |
| variation | (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon) | |
| vernal equinox | (astronomy) the equinoctial point that lies in the constellation of Pisces | |
| Narrower | astrodynamics | The branch of astronomy that studies the motion of natural and artificial bodies in space |
| astrometry | The branch of astronomy that deals with the measurement of the position and motion of celestial bodies | |
| astrophysics | The branch of astronomy concerned with the physical and chemical properties of celestial bodies | |
| celestial mechanics | The branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies | |
| radio astronomy | The branch of astronomy that detects and studies the radio waves emitted by celestial bodies | |
| selenology | The branch of astronomy that deals with the moon | |
| solar physics | The branch of astronomy that deals with the sun | |
| Broader | physics, natural philosophy | The science of matter and energy and their interactions |
| Spanish | astronomía | |
| Catalan | astronomia, uranology | |
| Nouns | uranologist | a physicist who studies astronomy |
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