# Definitions and Synonyms of *astronomy* | Another word for *astronomy* | What is *astronomy? *

*Definition 1: the branch of physics that studies celestial bodies and the universe as a whole - [noun denoting cognition]*

*Synonyms for astronomy in the sense of this definition*

*(**astronomy* is a kind of ...) the science of matter and energy and their interactions

*astronomy*is a kind of ...) the science of matter and energy and their interactions

### (... is a kind of

### (... is a kind of

### (... is a kind of

### (... is a kind of

### (... is a kind of

### (... is a kind of

### (... is a kind of

*"his favorite subject was physics"*### (... is a kind of *astronomy* ) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies

### (... is a kind of *astronomy* ) the branch of astronomy that deals with the sun

### (... is a kind of *astronomy* ) the branch of astronomy that deals with the moon

### (... is a kind of *astronomy* ) the branch of astronomy concerned with the physical and chemical properties of celestial bodies

### (... is a kind of *astronomy* ) the branch of astronomy concerned with the application of Newton's laws of motion to the motions of heavenly bodies

### (... is a kind of *astronomy* ) the branch of astronomy that detects and studies the radio waves emitted by celestial bodies

### (... is a kind of *astronomy* ) the branch of astronomy that studies the motion of natural and artificial bodies in space

*(astronomy* is the domain which ... is member of) (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior

### (astronomy is the domain which ... is member of) (astronomy) the plane on which a body is orbiting

### (astronomy is the domain which ... is member of) (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom

### (astronomy is the domain which ... is member of) (astronomy) a real or apparent slow oscillation of a moon or satellite

*"the libration of the moon"*

### (astronomy is the domain which ... is member of) (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases

### (astronomy is the domain which ... is member of) (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding

### (astronomy is the domain which ... is member of) (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)

### (astronomy is the domain which ... is member of) a physicist who studies astronomy

### (astronomy is the domain which ... is member of) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

### (astronomy is the domain which ... is member of) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

### (astronomy is the domain which ... is member of) (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto)

### (astronomy is the domain which ... is member of) (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction

### (astronomy is the domain which ... is member of) (astronomy) a celestial body (especially a star) relative to other objects in orbit around it

### (astronomy is the domain which ... is member of) (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day

### (astronomy is the domain which ... is member of) (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

### (astronomy is the domain which ... is member of) of or relating to or resembling a nebula

*"the nebular hypothesis of the origin of the solar system"*

### (astronomy is the domain which ... is member of) having an orbit between the sun and the Earth's orbit

*"Mercury and Venus are inferior planets"*

### (astronomy is the domain which ... is member of) having an orbit farther from the sun than the Earth's orbit

*"Mars and Jupiter are the closest in of the superior planets"*

### (astronomy is the domain which ... is member of) moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth

### (astronomy is the domain which ... is member of) moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth

### (astronomy is the domain which ... is member of) (of the sun) characterized by a low level of surface phenomena, such as sunspots

### (astronomy is the domain which ... is member of) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions

### (astronomy is the domain which ... is member of) observe the stars

### (astronomy is the domain which ... is member of) disappear beyond the horizon

*"the sun sets early these days"*

### (astronomy is the domain which ... is member of) come up, of celestial bodies

*"The sun also rises"*

*"The sun uprising sees the dusk night fled..."*

*"Jupiter ascends"*

### (astronomy is the domain which ... is member of) (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded

### (astronomy is the domain which ... is member of) (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions

### (astronomy is the domain which ... is member of) (astronomy) time based on the motion of the mean sun (an imaginary sun moving uniformly along the celestial equator)

### (astronomy is the domain which ... is member of) (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

### (astronomy is the domain which ... is member of) (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed

### (astronomy is the domain which ... is member of) (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun

### (astronomy is the domain which ... is member of) (astronomy) the alignment of the Earth and a planet on the opposite side of the sun

### (astronomy is the domain which ... is member of) (astronomy) the alignment of the Earth and a planet on the same side of the sun

### (astronomy is the domain which ... is member of) (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac

### (astronomy is the domain which ... is member of) (astronomy) the disappearance of a celestial body prior to an eclipse

### (astronomy is the domain which ... is member of) (astronomy) the reappearance of a celestial body after an eclipse

### (astronomy is the domain which ... is member of) (astronomy) the rising of a star above the horizon

### (astronomy is the domain which ... is member of) (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)

*"the full phase of the moon"*

### (astronomy is the domain which ... is member of) (astronomy) Ptolemy's model of the universe with the Earth at the center

### (astronomy is the domain which ... is member of) (astronomy) Copernicus' astronomical model in which the Earth rotates around the sun

### (astronomy is the domain which ... is member of) (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler

### (astronomy is the domain which ... is member of) (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer

### (astronomy is the domain which ... is member of) (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust

*"`extragalactic nebula' is a former name for `galaxy'"*

### (astronomy is the domain which ... is member of) (astronomy) the point in an orbit farthest from the body being orbited

### (astronomy is the domain which ... is member of) (astronomy) a point where an orbit crosses a plane

### (astronomy is the domain which ... is member of) (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion

### (astronomy is the domain which ... is member of) (astronomy) a cluster of stars (or a small constellation)

### (astronomy is the domain which ... is member of) (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; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere

*"one hour of right ascension equals fifteen degrees"*