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A sun dog (or sundog) or mock sun, formally called a parhelion^[1] (plural parhelia) in meteorology, is an atmosphericoptical phenomenon that consists of a bright spot to one or both sides of the Sun. Two sun dogs often flank the Sun within a 22° halo.

The sun dog is a member of the family of halos, caused by the refraction of sunlight by ice crystals in the atmosphere. Sun dogs typically appear as a pair of subtly colored patches of light, around 22° to the left and right of the Sun, and at the same altitude above the horizon as the Sun. They can be seen anywhere in the world during any season, but are not always obvious or bright. Sun dogs are best seen and most conspicuous when the Sun is near the horizon.

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Formation and characteristics[edit]

Sun dogs are commonly caused by the refraction and scattering of light from plate-shaped hexagonalice crystals either suspended in high and cold cirrus or cirrostratus clouds, or drifting in freezing moist air at low levels as diamond dust.^[2] The crystals act as prisms, bending the light rays passing through them with a minimum deflection of 22°. As the crystals gently float downwards with their large hexagonal faces almost horizontal, sunlight is refracted horizontally, and sun dogs are seen to the left and right of the Sun. Larger plates wobble more, and thus produce taller sundogs.^[3]

Sun dogs are red-colored at the side nearest the Sun; farther out the colors grade through oranges to blue. The colors overlap considerably and are muted, never pure or saturated.^[4] The colors of the sun dog finally merge into the white of the parhelic circle (if the latter is visible).^[5]

The same plate-shaped ice crystals that cause sun dogs are also responsible for the colorful circumzenithal arc, meaning that these two types of halo tend to co-occur.^[6] The latter is often missed by viewers, since it is located more or less directly overhead. Another halo variety often seen together with sun dogs is the 22° halo, which forms a ring at roughly the same angular distance from the sun as the sun dogs, thus appearing to interconnect them. As the Sun rises higher, the rays passing through the plate crystals are increasingly skewed from the horizontal plane, causing their angle of deviation to increase and the sun dogs to move farther from the 22° halo, while staying at the same elevation.^[7]

It is possible to predict the forms of sun dogs as would be seen on other planets and moons. Mars might have sun dogs formed by both water-ice and CO₂-ice. On the gas giant planets — Jupiter, Saturn, Uranus and Neptune—other crystals form clouds of ammonia, methane, and other substances that can produce halos with four or more sun dogs.^[8]

Terminology[edit]

A somewhat common misconception among the general public is to refer to any member of the ice halo family as a 'sun dog' (especially the 22° halo, being one of the most common varieties). However, sun dogs represent just one of many different types of halos. For referring to the atmospheric phenomenon in general, the term (ice crystal) halo(s) is more appropriate.

Etymology[edit]

The exact etymology of sun dog largely remains a mystery. The Oxford English Dictionary states it as being 'of obscure origin'.^[9]Aplikasi hack fb.

In Abram Palmer's 1882 book Folk-etymology: A Dictionary of Verbal Corruptions Or Words Perverted in Form Or Meaning, by False Derivation Or Mistaken Analogy, sun-dogs are defined:

The phenomena [sic] of false suns which sometimes attend or dog the true when seen through the mist (parhelions). In Norfolk a sun-dog is a light spot near the sun, and water-dogs are the light watery clouds; dog here is no doubt the same word as dag, dew or mist as 'a little dag of rain' (Philolog. Soc. Trans. 1855, p. 80). Cf. Icel. dogg, Dan. and Swed. dug = Eng. 'dew.'^[10]

(Dog in English as a verb can mean 'hunt, track, or follow',^[11] so Dog the true [sun] has meant track the true [sun] since the 1510s.^[12])

Alternatively, Jonas Persson suggested that out of Norse mythology and archaic names — Danish: solhunde (sun dog), Norwegian: solhund (sun dog), Swedish: solvarg (sun wolf) — in the Scandinavian languages, constellations of twowolves hunting the Sun and the Moon, one after and one before, may be a possible origin for the term.^[13]

Parhelion (plural parhelia) comes from Ancient Greek: παρήλιον (parēlion, 'beside the sun'; from παρά (para, 'beside') and ἥλιος (helios, 'sun')).^[14]

In the Anglo-Cornish dialect of Cornwall, United Kingdom, sun dogs are known as weather dogs (described as 'a short segment of a rainbow seen on the horizon, foreshowing foul weather'). It is also known as a lagas in the sky which comes from the Cornish language term for the sun dog lagas awel meaning 'weather's eye' (lagas, 'eye' and awel, 'weather/wind'). This is in turn related to the Anglo-Cornish term cock's eye for a halo round the sun or the moon, also a portent of bad weather.^[15]

History[edit]

Greece[edit]

Aristotle (Meteorology III.2, 372a14) notes that 'two mock suns rose with the sun and followed it all through the day until sunset.' He says that 'mock suns' are always to the side, never above or below, most commonly at sunrise or sunset, more rarely in the middle of the day.^[16]

The poet Aratus (Phaenomena 880–891) mentions parhelia as part of his catalogue of Weather Signs; according to him, they can indicate rain, wind, or an approaching storm.^[17]

Artemidorus in his Oneirocritica ('On the Interpretation of Dreams') included the mock suns amongst a list of celestial deities.^[18]

Rome[edit]

A passage in Cicero's On the Republic (54–51 BC) is one of many by Greek and Roman authors who refer to sun dogs and similar phenomena:

Be it so, said Tubero; and since you invite me to discussion, and present the opportunity, let us first examine, before any one else arrives, what can be the nature of the parhelion, or double sun, which was mentioned in the senate. Those that affirm they witnessed this prodigy are neither few nor unworthy of credit, so that there is more reason for investigation than incredulity.^[19]

Seneca makes an incidental reference to sun dogs in the first book of his Naturales Quaestiones.^[20]

The 2nd century Roman writer and philosopher Apuleius in his Apologia XV says 'What is the cause of the prismatic colours of the rainbow, or of the appearance in heaven of two rival images of the sun, with sundry other phenomena treated in a monumental volume by Archimedes of Syracuse.'^{[citation needed]}

Wars of the Roses[edit]

Chronicle of the Grey Friars of London, [London] Printed for the Camden society, 1852

The prelude to the Battle of Mortimer's Cross in Herefordshire, England in 1461 is supposed to have involved the appearance of a halo display with three 'suns'. The Yorkist commander, later Edward IV of England, convinced his initially frightened troops that it represented the three sons of the Duke of York, and Edward's troops won a decisive victory. The event was dramatized by William Shakespeare in King Henry VI, Part 3,^[21] and by Sharon Kay Penman in The Sunne In Splendour.

Jakob Hutter[edit]

Possibly the earliest clear description of sun dogs is by Jacob Hutter, who wrote in his Brotherly Faithfulness: Epistles from a Time of Persecution:

My beloved children, I want to tell you that on the day after the departure of our brothers Kuntz and Michel, on a Friday, we saw three suns in the sky for a good long time, about an hour, as well as two rainbows. These had their backs turned toward each other, almost touching in the middle, and their ends pointed away from each other. And this I, Jakob, saw with my own eyes, and many brothers and sisters saw it with me. After a while the two suns and rainbows disappeared, and only the one sun remained. Even though the other two suns were not as bright as the one, they were clearly visible. I feel this was no small miracle…^[22]

The observation most likely occurred in Auspitz (Hustopeče), Moravia on 31 October 1533. The original was written in German and is from a letter originally sent in November 1533 from Auspitz in Moravia to the Adige Valley in Tyrol. The Kuntz Maurer and Michel Schuster mentioned in the letter left Hutter on the Thursday after the feast day of Simon and Jude, which is 28 October. The Thursday after was 30 October.^[23] It is likely that the 'two rainbows with their backs turned toward each other, almost touching' involved two further halo phenomena, possibly a circumzenithal arc (prone to co-occur with sun dogs) together with a partial 46° halo or supralateral arc.^[24]

Vädersolstavlan[edit]

While mostly known and often quoted for being the oldest color depiction of the city of Stockholm, Vädersolstavlan (Swedish; 'The Sundog Painting', literally 'The Weather Sun Painting') is arguably^{[citation needed]} also one of the oldest known depictions of a halo display, including a pair of sun dogs. For two hours in the morning of 20 April 1535, the skies over the city were filled with white circles and arcs crossing the sky, while additional suns (i.e., sun dogs) appeared around the sun. The phenomenon quickly resulted in rumours of an omen of God's forthcoming revenge on King Gustav Vasa (1496–1560) for having introduced Protestantism during the 1520s and for being heavy-handed with his enemies allied with the Danish king.^{[citation needed]}

Hoping to end speculations, the Chancellor and Lutheran scholar Olaus Petri (1493–1552) ordered a painting to be produced documenting the event. When confronted with the painting, the king, however, interpreted it as a conspiracy – the real sun of course being himself threatened by competing fake suns, one being Olaus Petri and the other the clergyman and scholar Laurentius Andreae (1470–1552), both thus accused of treachery, but eventually escaping capital punishment. The original painting is lost, but a copy from the 1630s survives and can still be seen in the church Storkyrkan in central Stockholm.

Rome, 1629 and 1630[edit]

A series of complex parhelia displays in Rome in 1629, and again in 1630, were described by Christoph Scheiner in his book Parhelia, one of the earliest works on the subject. It had a profound effect, causing René Descartes to interrupt his metaphysical studies and led to his work of natural philosophy called The World.^[25]

Danzig 1661[edit]

On 20 February 1661 the people of Danzig witnessed a complex halo display, described by Georg Fehlau in a pamphlet, the Sevenfold Sun Miracle, and again the following year by Johannes Hevelius in his book, Mercurius in Sole visus Gedani.

St Petersburg 1790[edit]

Soni soni mohabbatein mp3 download. On 18 June 1790 Johan Tobias Lowitz [de], in St Petersburg, observed a complex display of haloes and parhelia which included his Lowitz arcs.

Newfoundland 1843[edit]

In 1843, winter in the British Colony of Newfoundland was referred to as the 'Winter of Three Suns' and was unusually cold with 15 days of temperatures between 3–10 degrees below zero.^[26]

Great Sioux War of 1876–77[edit]

'Part of the time we marched in the teeth of a biting storm of snow, and at every hour of the day the sun could be discerned sulking behind soft grey mists in company with rivals, known in the language of the plains as 'Sun-dogs', whose parahelic splendors warned the traveler of the approach of the ever-to-be-dreaded 'blizzard'.'^[27]

See also[edit]

References[edit]

1. ^'American Heritage Dictionary Entry — parhelion'. The American Heritage Dictionary of the English Language. Retrieved 16 May 2017.
2. ^'Diamond dust'. Atmospheric Optics. Retrieved 16 May 2017.
3. ^'Sundog formation'. Atmospheric Optics. Retrieved 16 May 2017.
4. ^'Sundog Colours'. Atmospheric Optics. Retrieved 16 May 2017.
5. ^'Parhelic Circle'. Atmospheric Optics. Retrieved 16 May 2017.
6. ^'Circumzenithal Arc'. Atmospheric Optics. Retrieved 16 May 2017.
7. ^Cowley, L. 'Sundogs & Sun Altitude'. Atmospheric Optics. Retrieved 16 May 2017.
8. ^Cowley, L. 'Other Worlds'. Atmospheric Optics. Retrieved 16 May 2017.
9. ^'Sundog'. Oxford English Dictionary. Retrieved 16 May 2017.
10. ^Palmer, Abram Smythe (1882). Folk-etymology: A Dictionary of Verbal Corruptions Or Words Perverted in Form Or Meaning, by False Derivation Or Mistaken Analogy. G. Bell and Sons.
11. ^'Dog'. Merriam-Webster Dictionary. Retrieved 3 December 2017.
12. ^Harper, Douglas. 'dog'. Online Etymology Dictionary. Retrieved 3 December 2017.
13. ^Persson, Jonas. 'Norse Constellations'. Digitalis Education Solutions, Inc. Retrieved 16 May 2017.
14. ^'Parhelion'. Oxford English Dictionary. Retrieved 16 May 2017.
15. ^Nance, Robert Morton; Pool, P. A. S. (1963). A Glossary of Cornish Sea-Words. Federation of Old Cornwall Societies. pp. 61, 104, 155, 172.
16. ^'Meteorology by Aristotle – Part 2'. The Internet Classics Archive. Retrieved 16 May 2017.
17. ^'Aratus, Phaenomena'. Theoi Classical Texts Library. Retrieved 16 May 2017.
18. ^p. 125 Artemidorus – The Interpretation Of Dreams Oneirocritica by Artemidorus Translation and Commentary by Robert J. White c. 1975 1990 Origingal Books, Inc. 2nd Edition ISBN0-944558-03-8
19. ^Cicero (1877). On the Commonwealth, Book 1. Translated by CD Yonge. Project Gutenberg. pp. (260), 367, (369).
20. ^Seneca, Ricerche sulla Natura, P. Parroni editor, Mondadori, 2010
21. ^Young, Jennifer (2 October 2011). 'The Mortimer's Cross Parhelion: How a Meteorological Phenomenon Changed English History'. Decoded Science. Retrieved 16 May 2017.
22. ^Hutter, Jakob (1979). Brotherly Faithfulness: Epistles from a Time of Persecution. Rifton, NY: Plough Publishing. pp. 20–21. ISBN978-0-87486-191-4.
23. ^Schaaf, Fred (November – December 1997), Sky & Telescope, p. 94
24. ^'Look for the rare one'. Atmospheric Optics. Retrieved 16 May 2017.
25. ^René Descartes – Metaphysical turn, Stanford Encyclopaedia of Philosophy
26. ^Payne (1905–1984), John C. J. C. Payne Scrapbooks (newspaper clippings). Harbour Grace Public Library. Harbour Grace, NL.
27. ^Bourke, John (1966). Mackenzie's Last Fight with the Cheyennes. Argonaut Press Ltd. p. 10.

Further reading[edit]

• Minnaert, Marcel (1993), Light and Color in the Outdoors, Springer, ISBN978-0-387-97935-9

External links[edit]

• Sundogs – Parhelia, Explanations and Images
• SDO Sundog Mystery – A phenomenon that occurred during the launch of the Solar Dynamics Observatory
• Nemiroff, R.; Bonnell, J., eds. (8 November 2011). 'Jumping Sundog video and explanation'. Astronomy Picture of the Day. NASA. Retrieved 16 May 2017.