n
(military) The innermost circle of a nuclear explosion, within which all structures are destroyed.
n
(rare) Alternative spelling of occultation. [(astronomy) An astronomical event that occurs when one celestial object is hidden by another celestial object that passes between it and the observer when the nearer object appears larger and completely hides the more distant object.]
n
(astronomy) The angular distance of a heavenly body above our Earth's horizon.
n
(astronomy) The arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object.
n
(astronomy) A deviation due to the Earth's orbital motion.
n
(astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.
n
(astronomy) Any of various angular distances.
n
(astronomy, obsolete) An apparent motion of a planet toward the west.
adj
(astronomy) opposite to the sun (from the Earth)
n
(physics) The lowest point on a pendant drop of a liquid.
n
(astronomy) A period of consecutive days or nights when a particular celestial body may be observed, beginning with the heliacal rising of the body and ending with its heliacal setting.
n
A small deviation in the Earth's axis of rotation relative to the solid earth.
n
(astronomy) An orbit that approaches two astronomical bodies on a regular basis.
n
(units of measure, astronomy) ¹⁄₁₂ the apparent diameter of the sun or moon, (chiefly) as a measure of the totality of an eclipse.
n
(astronomy) A deviation due to the earth's axial rotation.
n
(astronomy) An alignment of astronomical objects whereby one object comes between the observer (or notional observer) and another object, thus obscuring the latter.
n
(astronomy) The end of the transit of a celestial body through the disk of an apparently larger one.
n
(astronomy) The reappearance of a heavenly body after being eclipsed by another or by the sun's brightness.
n
(astronomy) Modification of the lunar orbit due to the gravitational effects of the Sun.
n
(astronomy) The moment, during an eclipse or transit, when the apparent positions of the two bodies first touch.
n
(physics) The discrepancy between current scientific models and the actual increase in speed observed during a planetary flyby by a spacecraft.
n
(astronomy) The region at which tubes of magnetic field lines reach the surface of the photosphere to form coronal loops.
n
(astronomy) A faint brightening of the night sky in the region of the ecliptic directly opposite the Sun.
n
(astronautics) The process of using such an orbit to transfer between two other orbits.
n
(astronomy) The disappearance of a celestial body, by passing either behind another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite.
v
(astronomy) To spiral inward
n
(astrology, obsolete) Motion of a celestial object from one place to another; local motion.
n
(astronomy) The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface.
n
(astronomy, geology) Any long marking, dark or bright, on a planet or moon's surface.
n
Alternative form of McDowell line [(aerospace) The altitude of periapsis at which atmospheric drag will prevent an object from successfully orbiting.]
n
(astronomy, celestial mechanics) An orbital parameter of a celestial body (in an elliptic orbit); the mean motion multiplied by the time since the last passage through periapsis; the angle PCM (measured in radians) defined by P = the periapsis, C = the center of the elliptical orbit, and M = the mean planet.
n
The principal piece of an astrolabe, into which the others are fixed.
n
(astronomy) An astronomical event that occurs when one celestial object is hidden by another celestial object that passes between it and the observer when the nearer object appears larger and completely hides the more distant object.
n
A clockwork model of any given solar system.
n
(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.
n
Any of several slow changes in an astronomical body's rotational or orbital parameters.
v
(astronomy) To find an older image of an object in archived images after it has been discovered.
n
(astronomy) The change in apparent position of a celestial body due to that body's velocity relative to the Sun.
n
(astrology) The apparent movement of a planet across the sky in the opposite direction from its ordinary movement.
n
In the case of celestial bodies, the traversal of one body along an orbit around another body.
n
(astronomy) A star, especially when seen as the centre of any single solar system.
n
The apparent passing of one planet by another in longitude.
n
(astronomy, very rare) An exceedingly powerful, enormous solar prominence.
n
(astronomy) The passage of a celestial body across the observer's meridian, or across the disk of a larger celestial body.
n
(astronomy) Deviation from the mean orbit of a heavenly body.
n
(astronomy) The point in the sky vertically above a given position or observer; the point in the celestial sphere opposite the nadir.
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