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J Astronomy


a stony meteorite without rounded grains. achondrite
of or like an ACHONDRITE. achondritic
occurring at nightfall or sunset, (esp. of the rising or setting of stars. acronic acronical acronycal acronychal
the fraction of light reflected from a body or surface: ALBEDOS or (US) ALBEDOES. albedo
a circle of altitude, parallel to the horizon. almacantar almucantar
a textbook or handbook, especially dealing with astronomy. almagest
the figure-8 on a map showing the sun's seasonal course: ANALEMMAS or ANALEMMATA. analemma
part of Saturn's rings: ANSAE. ansa
situated at the opposite side of the earth or moon; diametrically opposed; (noun) an antipodal cell: ANTIPODALS. antipodal
opposite to the sun; -- said of the point in the heavens 180° distant from the sun. antisolar
relating to an APHELION, the point when the earth is farthest from the sun during its annual orbit. aphelian
the point when the earth is farthest from the sun during its annual orbit: APHELIA or APHELIONS. [Gk. apo, from + helios, sun]. aphelion
the high point in an orbit: APOAPSIDES. apoapsis
relating to an APOGEE. apogaeic apogeal apogean apogeic
the outermost point in an orbit; the highest point; the apex: APOGEES. apogee
the point in the orbit of a body revolving round the moon that is farthest from the centre of the moon. apolune
the close approach of a planet or asteroid to a star without the occurrence of an eclipse. appulse
relating to an APPULSE, the close approach of a planet or asteroid to a star without the occurrence of an eclipse: APPULSIVELY+. appulsive+
the point at which a heavenly body is most or least distant from centre of attraction: APSIDES. apsis
description of the physical features of the planet Mars. areography
the study of Mars. [From Ares, the Greek equivalent of Mars in classical mythology) + logy (study)]. areology
a constellation of stars; a group of asterisks; appearance of star-like reflection by certain crystals. asterism
a type of celestial body. asteroid
of or pertaining to an ASTEROID. asteroidal
the wound left by a meteorite strike. astrobleme+
a domed window in an aircraft for astronomical observations. astrohatch+
a person engaged in space travel. astronaut
a person who is skilled in astronomy or who makes observations of celestial phenomena. astronomer
related to ASTRONOMY. astronomic astronomical
to study astronomy. astronomise astronomize
the study of the celestial bodies and the heavens in all scientific aspects. astronomy
the angle a celestial object makes from due north, when measured in an eastwards direction along the horizon. [Arabic al-sumut, from al, the + samt, way]. azimuth
of or pertaining to the AZIMUTH: AZIMUTHALLY. azimuthal
a shift of the spectrum towards the blue. Cf. REDSHIFT. blueshift
having its light shifted towards the blue. blueshifted
a large meteor that bursts; a fireball. bolide
pertaining to the dog star, or the dog days of summer. canicular
a star of a type having regular cycles of brightness which can be used to deduce their distances (aka 'standard candle'). cepheid
the nebulous part of a comet. chevelure
a meteoric stone characterized by the presence of CHONDRULES. chondrite
situated or moving round the moon. circumlunar
situated or moving round the sun. circumsolar
on this side of the moon, i.e. between moon and earth. cislunar
an astronomical instrument used to reflect light on to a telescope. coelostat
a star that has collapsed under its own gravity to form a black hole. collapsar
a telescope arranged and used to determine errors of collimation, both vertical and horizontal. collimator
a celestial circle that intersects another at the poles. [Gr. kolouros, from kolos, docked + oura, tail]. colure
a spherical cloud of material surrounding the head of a comet: COMAE or COMAS. coma
relating to a COMA. comal
a heavenly body with a (usu) elliptical orbit round the sun, having a main nucleus composed of rocky fragments held together with ice and surrounded by a cloud of dust and gas. comet
relating to a COMET. cometary cometic
the study of comets. cometology
one of the sun's envelopes, outside the chromosphere, observable during total eclipse: CORONAS or CORONAE. corona
of or pertaining to the universe as an ordered system or totality: COSMICALLY. cosmic cosmical
relating to cosmology. cosmologic+ cosmological
the study of the COSMOS. cosmology
the world or universe: COSMOSES, KOSMOSES. [Gk. kosmos]. cosmos kosmos
(of a reflecting telescope) in which one or more plane mirrors reflects the light down the polar axis. (The e has an accent). coude
the side of a planet facing the sun. dayside
the planet Venus. daystar
to come out of an orbit. deorbit
having no disk; appearing as a point and not expanded into a disk, as the image of a faint star in a telescope. diskless
the faint light visible on parts of the moon not illuminated by the sun. earthlight
like the planet earth. earthlike
the rising of the earth as seen from the moon. earthrise
the setting of the earth as seen from the moon. earthset
the faint light visible on parts of the moon not illuminated by the sun. earthshine
the total or partial disappearance of a heavenly body by the interposition of another between it and the spectator; (verb) to obscure. eclipse
an imaginary circle which the sun follows from Earth perspective: ECLIPTICALLY(+). ecliptic
the act of emerging esp. the reappearance of a heavenly body after eclipse or occultation. emersion
a table giving the positions of celestial bodies at different times: EPHEMERIDES. ephemeris
one who studies the daily motions and positions of the planets. ephemerist
a term in Ptolemy's astronomical system. [L. aequare, to make equal]. equant
a lunar inequality, the combined effect of the irregularity of the point of the moon's orbit at which it is nearest to Earth and the alternate increase and decrease of the eccentricity of the moon's orbit. evection
relating to EVECTION. evectional+
a planet that orbits a star in another solar system. exoplanet+
beyond the solar system. extrasolar+
an unusually bright spot on the sun's surface: FACULAE. facula
of or pertaining to FACULAE. facular
a burning meteor, a BOLIDE. fireball
a star system. galaxy
a space probe for exploring space near the earth. geoprobe
of or pertaining to a satellite that travels about the earth's equator at an altitude of at least 35,000 kilometers at a speed matching that of the earth's rotation, thus maintaining a constant relation to points on the earth. geostationary
of a moon, between half and full. gibbose gibbous
the state of being GIBBOSE. gibbosity
solar; coincident with that of the sun, or as nearly as could be observed: HELIACALLY. heliac heliacal
the science of the sun. heliology
an instrument for observing sun without injury to the eyes. helioscope
an exploding star than produces even more energy and light than a SUPERNOVA: HYPERNOVAE or HYPERNOVAS. hypernova+
unerring, fixed (of a star). inerrant
situated in or relating to the spaces between galaxies. intergalactic
relating to the period of the moon's invisibility. interlunar interlunary
see COSMOS. kosmos
the pole-star; one that serves as an inspiration, model or guide. loadstar lodestar
one who travels to the moon. lunanaut lunarnaut
relating to the moon; (noun) a lunar distance: LUNARS. lunar
a little moon or satellite. lunet
relating jointly to the moon and sun. lunisolar
pertaining to tidal movements dependent on the moon. lunitidal
a type of neutron star that has a very intense magnetic field. magnetar+
a sea on the moon: MARIA. mare
a seismic disturbance on Mars. marsquake
a concentration of dense mass beneath the moon's surface. mascon
the whole universe considered as a system of galaxies. metagalaxy
relating to a METAGALAXY. metagalactic
a small celestial body that enters the earth's atmosphere. meteor
a meteor that has not reached the earth's atmosphere. meteoroid
of the nature or appearance of a meteor. meteorous
a very small meteorite. micrometeorite
a very small meteoroid. micrometeoroid
the satellite of a planet; (verb) to spend time idly: MOONS, MOONED, MOONING. moon
lacking the light of the moon. moonless
a small moon. moonlet
resembling the moon. moonlike
a phase of the moon. moonphase
a seismic disturbance on the moon. moonquake
a view of the moon's surface. moonscape
the setting of the moon. moonset
the sum of all universes. multiverse+
the point of the heavens diametrically opposite to the zenith; the point directly below an observer. [Arabic nazir, opposite to]. nadir
of or like a NADIR. nadiral
a hazy or indistinct luminous area in the night sky representing a distant cluster of stars: NEBULAE or NEBULAS. nebula
of or like a NEBULA. nebular
like a NEBULA, cloudy. nebulose
like a NEBULA, cloudy: NEBULOUSLY. nebulous
of or pertaining to the nodes, as, the nodical revolutions of the moon. nodical
not related to the sun. nonsolar
an exploding star: NOVAE or NOVAS. nova
like a NOVA. novalike
to move or revolve around: ORBITS, ORBITING, ORBITED. orbit
relating to an orbit: ORBITALLY(+); (noun) an orbit: ORBITALS. orbital
an apparatus showing the relative positions and motions of bodies in the solar system by balls moved by wheelwork: ORRERIES. [From Charles Boyle, 4th Earl of Orrery (1676-1731), who was given such a models by John Rowley, a London instrument-maker] orrery
the seeming change of an object's position due to the observer moving. parallax
a mock moon; bright patch on a lunar halo: PARASELENAE. paraselene
relating to the PARASELENE. paraselenic+
the closest point to a central body reached by a body in orbit: PERIAPSES. periapsis+
that point, in the real or apparent orbit of one star revolving around another, at which the former is nearest to the latter: PERIASTRONS. periastron
the point in the path of a body revolving round a centre at which it is nearest to the centre. pericenter+ pericentre+
relating to a PERIGEE. perigeal perigean
the point of the moon's orbit at which it is nearest the earth. [Gk. perigeion neuter of perigeios round or near the earth, from peri and ge earth]. Cf. APOGEE. perigee
relating to the PERIHELION. perihelial
the point of the orbit of a planet or a comet at which it is nearest to the sun, as opposed to APHELION: PERIHELIA. perihelion
the point in the path of a body orbiting the moon that is nearest to the centre of the moon. perilune
any of the celestial bodies (including the earth, but other than a comet or meteor) that revolve about the sun reflecting the sun's light. planet
of or pertaining to the planets; (noun) a train of planetary gears. planetary
an asteroid or similar tiny celestial body. planetesimal
relating to a PLANET. planetic
of or pertaining to planets. planetical
a body resembling a planet; an asteroid. planetoid
study of planets. planetology
of or relating to the full moon. plenilunar
a supernova remnant emitting radiation from both centre and shell. plerion+
the first-magnitude star Ursae Minoris, now within one degree of the north celestial pole. polestar
a galaxy in its initial state of formation. protogalaxy
a planet in its initial state of formation. protoplanet
a condensing mass of gas in the early formation of a star. protostar
a cosmic source of regular and rapid pulses of radiation usu. at radio frequencies, believed to be a rapidly rotating neutron star. pulsar
a celestial object that resembles a star optically but is inferred to be an extremely remote and immensely powerful source of light and other radiation. quasar
the displacement of the light a receding object emits toward the red end of the spectrum. Cf. BLUESHIFT. redshift
having its light shifted towards the red. redshifted
one of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon. rille
a satellite: SATELLITES. satelles
a body revolving around a planet; (verb) to transmit by satellite: SATELLITES, SATELLITING, SATELLITED. satellite
lunar. selenian
of or relating to the moon. [Gk. selene, moon]. selenic
pertaining to moon's centre; having moon as centre. selenocentric
the branch of astronomy dealing with the physical features of the moon. selenography
study of the moon. selenology
a half-moon shape. semilune
having the shape of a SEMILUNE. semilunar semilunate
a type of meterorite, composed of solidified lava from celestial bodies other than earth. shergottite
of or relating to the stars; measured by apparent motion of the stars: SIDEREALLY(+). sidereal
a meteorite made up partly of stone, partly of iron. siderolite
a point in space-time at which gravitational forces cause matter to have infinite density and infinitesimal volume, and space and time to become infinitely distorted. singularity
an orbiting experimental space station. skylab
related to the sun; (noun) an upper room, a garret. solar
relating to sun and moon. solunar+
a rapidly spinning galactic body. spinar
an orbiting spacecraft. sputnik
a common proper motion of a number of stars in the same region. stardrift
cosmic dust, meteoric matter in fine particles. stardust
to observe stars. stargaze
the light of stars. starshine
an area of relative darkness on the surface of a star. starspot
relating to stars. stellar
a star smaller than a dwarf star. subdwarf+
under the moon, terrestrial. sublunar sublunary
directly under the sun, as a point on the earth's surface where the sun is vertically overhead. subsolar
the star that is the source of light; (verb) to expose to the sun's rays. sun
like or resembling the sun. sunlike
a dark spot on the surface of the sun. sunspot
showing SUNSPOTS. sunspotted+
a very bright star of enormous size and low density, such as Antares. supergiant
above the moon, not of this world. superlunar superlunary
a very brilliant nova resulting from an explosion which blows the star's material into space, leaving an expanding cloud of gas: SUPERNOVAE or SUPERNOVAS. supernova
the passing of a spacecraft near a planet to use its gravitational pull: SWINGBYS. swingby
related to a SYZYGY. syzygal syzygial
relating to a SYZYGY, conjunction or opposition. syzygetic+
a conjunction or opposition. [Gk. syzygia union, coupling]. syzygy
a prism telescope. teinoscope
to make (another planet) earth-like. terraform
a lessening in the number of atomic particles and cosmic rays passing through the earth's atmosphere. thindown
the apparent passage of a smaller planet, etc over the disc of a greater; (verb) to pass across or through (something); to traverse: TRANSITS, TRANSITING, TRANSITED. transit
of or relating to the region beyond the moon's orbit. translunar translunary
the seven stars of the Plough. [L. triones plough-oxen]. N.B. no TRIONE*. triones
the totality of all existing things. universe
descriptive astronomy and mapping. uranography
the study of the heavens; astronomy. uranology
a meteor. ursid+
the highest point. zenith
of or pertaining to the ZENITH. zenithal
Created by: sc_from_or