• WordNet 3.6
    • n Neptune a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846"
    • n Neptune (Roman mythology) god of the sea; counterpart of Greek Poseidon
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Additional illustrations & photos:

Neptune comes to the aid of the sailors Neptune comes to the aid of the sailors

Webster's Revised Unabridged Dictionary
  • Interesting fact: Neptune was the first planet in our solar system to be discovered by mathematics
    • Neptune (Astron) The remotest major planet of our solar system, discovered -- as a result of the computations of Leverrier, of Paris -- by Galle, of Berlin, September 23, 1846. It is classed as a gas giant, and has a radius of 22,716 km and an estimated mass of 1.027 x 1026 kg, with an average density of 2.27 g/cc. Its mean distance from the sun is about 5,000,000,000 km (3,106,856,000 miles), and its period of revolution is about 164.78 years.
    • Neptune (Rom. Myth) The son of Saturn and Ops, the god of the waters, especially of the sea. He is represented as bearing a trident for a scepter.
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Century Dictionary and Cyclopedia
  • Interesting fact: One Neptune year lasts 165 Earth years
    • n Neptune In Roman mythology, the god of the sea, who came to be identified by the Romans themselves with the Greek Poseidon, whose attributes were transferred by the poets to the ancient Latin deity. In art Neptune is usually represented as a bearded man of stately presence, with the trident as his chief attribute, and the horse and the dolphin as symbols.
    • n Neptune Figuratively, the ocean.
    • n Neptune In heraldry, same as Triton.
    • n Neptune The outermost known planet of the solar system, and the third in volume and mass, though quite invisible to the naked eye. It was discovered in the autumn of 1846. Uranus, the planet next to Neptune, revolving about the sun in eighty-four years, was discovered in 1781; but observations of it as a fixed star were scattered through the eighteenth century. In 1821 Bouvard found that the observations of Uranus could not be satisfied by any theory based on the gravitation of known bodies, and hinted at an undiscovered planet. During the following twenty years further observations satisfied astronomers that such a planet must exist. To find where it could be was the problem which two mathematicians, J. C. Adams in England and U. J. J. Leverrier in France, set themselves to solve by mathematics. The calculations of Leverrier assigned the boundaries of a not very large region within which the unknown planet might be. In consequence of the indications of Adams, the astronomer Challis observed the planet Neptune August 4th and 12th, 1846, but, neglecting to work up his observations, failed to recognize it as a planet; while, in consequence of the indications of Leverrier, Galle of Berlin discovered Neptune September 23d, l846. The orbit of the new planet, having been determined from direct observations, was found to differ excessively from the predictions in all its elements; so much so that Leverrier declared these elements “incompatible with the nature of the irregular perturbations of Uranus.” The distance from the sun was 30 times instead of 36 times that of the earth, as predicted; and the orbit, instead of being more elliptical than that of any planet except Mercury, was in fact the most circular of all. When Neptune was discovered by Dr. Galle it was only 1° from the predicted place; but this would not have been so at the epoch to which the calculations referred, and there was nothing in their nature to render them particularly accurate for 1846, so that this coincidence must be regarded as in great measure a happy accident, such as would occur by mere chance once in 180 times. A satellite to Neptune was detected in October, 1846, by Lassell. Its period of revolution is 5 days, 21 hours, and 8 minutes, and its maximum elongation 18″. The mass of Neptune, having been calculated from these data, was found to be 1⁄19700 that of the sun, against predicted values nearly twice as great. With the mass so ascertained, the perturbing action upon Uranus was calculated, and found to satisfy the observations of that planet much better than either Leverrier's or Adams's hypothesis had done. This was because the real action of Neptune upon the orbit of Uranus was of a different kind from what it had been assumed to be, those terms of the mathematical expressions which had been assumed to be the principal ones being really insignificant, and those which had been neglected as insignificant being really the controlling ones. The name Neptune was conferred by Encke, Leverrier having signified that he wished it called by his own name. The diameter of Neptune is 37,000 miles. Its distance from the sun is about 2,800,000,000 miles, and its period of revolution about 164 years.
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Chambers's Twentieth Century Dictionary
  • Interesting fact: Every 238 years, the orbits of Neptune and Pluto change making Neptune at times the farthest planet from the sun
    • n Neptune nep′tūn (Rom. myth.) the god of the sea, identified with the Greek Poseidon, represented with a trident in his hand:
    • n Neptune nep′tūn (astron.) the outermost planet of the solar system, discovered in 1846
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Webster's Revised Unabridged Dictionary
L. Neptunus,
Chambers's Twentieth Century Dictionary
L. Neptunus.


In literature:

Clay owned the Neptune, a broad decked craft, built somewhat on the order of the primitive Rob Roy.
"Canoe Boys and Campfires" by William Murray Graydon
"The Venetian Painters of the Renaissance" by Bernhard Berenson
"Pagan and Christian Rome" by Rodolfo Lanciani
The heaving of the great pans, like battering-rams against the sides of the Neptune, made a woesome noise below decks.
"A Labrador Doctor" by Wilfred Thomason Grenfell
The Romans worshipped Poseidon under the name of Neptune, and invested him with all the attributes which belong to the Greek divinity.
"Myths and Legends of Ancient Greece and Rome" by E.M. Berens
She prevails, Jove sleeps, and Neptune seizes the opportunity to aid the Trojans.
"The Iliad of Homer (1873)" by Homer
Mighty Neptune, may it please, I.
"The Hesperides & Noble Numbers: Vol. 1 and 2" by Robert Herrick
He went to Neptune, told his tale, and begged him to lend him a winged chariot in which he could fly away with Marpessa.
"A Book of Myths" by Jean Lang
Right along with Jupiter and Neptune and Pluto and all the rest of the Gods.
"Pagan Passions" by Gordon Randall Garrett
The boatswain represents Neptune and becomes sovereign for a time.
"The Shellback's Progress" by Walter Runciman

In poetry:

No more Apollo reins the sun
Or Neptune rides the sea,
The race of Oread is run,
And Pan has ceased to be:
"Dominions Of The Boundary" by Bernard O Dowd
Off Vincent, eighty fathoms deep,
With roofs of coral and pale shell lies Neptune's city,
Wherein sleep the weary sailors, wherein dwell
The Weavers of the deepest spell.
"In Neptune's City" by Theodore Goodridge Roberts
Temples of Neptune invaded by the sea
And dolphins streaked like streams sportive
As sunlight rode and over the rushing floors
The sea unfurled and what was blue raced silver.
"The Return" by John Peale Bishop
At his sight, the sun hath turned,
Neptune in the waters burned;
Hell hath felt a greater heat;
Jove himself forsook his seat:
From the centre to the sky,
Are his trophies reared high.
"Venus' Runaway" by Ben Jonson
To court thee to Britannia's arms
Serene the climes and mild the sky,
Her region boasts unnumber'd charms,
Thy welcome smiles in ev'ry eye.
Thy promise, Neptune keep, record my pray'r,
Not give my wishes to the empty air.
"Ode To Neptune" by Phillis Wheatley
Thou frantike sot quoth Neptune tho, thinke not that I wil stur
Or speake against the mightie Ioue, whose power doth passe so fur,
To whom ech one ought to obey, he is to loftie he,
He is our king, our maister Lord, his vassals al we be.
"Book VIII" by Arthur Hall

In news:

Tegan and Sara with Speak @ Neptune Theatre 9/24.
Neptune police charge Asbury Park man with stolen gun.
Google Maps Neptune police responded to Milton and Taylor avenues after a report of a man with a gun, police said.
A Neptune 20-year-old risks 30 years to life in prison if he's convicted of shooting an Asbury Park man to death last November.
Neptune Wine Fest coming up Sept 15-16 in Virginia Beach.
Neptune wine fest ( September 12, 2012 ).
The distant planets of the solar system, Uranus and Neptune , will be visible if the sky is clear.
Hamptons Neptune or Summers Beach Club 1987.
Neptune 's time to shine.
Residents honor Neptune with Mustang donations.
Bright planets occupy both evening and morning skies this month while one of their fainter siblings, distant Neptune , reaches opposition and peak visibility.
Photo courtesy of Neptune Aviation Services.
A photo of Neptune and its moon Triton as captured by the Voyager 2.
Order of Isis and Neptune 's Daughters.
Enlarge Lillian Dean your Mardi Gras Lady Photos from the 2012 Neptune 's Daughter parade and ball.

In science:

Based on the models of adiabatic mass loss, it seems plausible that giant planets with cores can be transformed into either super-Earths or Neptune-like planets during their orbital circularization process.
On the Survivability and Metamorphism of Tidally Disrupted Giant Planets: the Role of Dense Cores
From top to bottom, the red bars represent the range of rp /rt values at typical sizes of Jupiter, Neptune and Earth, respectively (see the text for more details).
On the Survivability and Metamorphism of Tidally Disrupted Giant Planets: the Role of Dense Cores
Based on these results, we propose that some gas giant planets with dense cores could be effectively transformed to a super-Earth or Neptune-size object after multiple close encounters.
On the Survivability and Metamorphism of Tidally Disrupted Giant Planets: the Role of Dense Cores
If it can be determined that some of the observed sample of close-in Neptunes and super-Earths are relics of this dynamical history, we may be better equipped to understand the nature of late-phases of planetary formation.
On the Survivability and Metamorphism of Tidally Disrupted Giant Planets: the Role of Dense Cores
Using only this similarity, one could immagine that Triton formed near the present orbit of Mars,was somehow ejected from this region and captured by Neptune.
Basic notions of dense matter physics: applications to astronomy