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Topic: Analemma

	The Analemma (Site not responding. Last check: 2007-10-26)
		Actually, the ecliptic motion is tilted 23.5 degrees to the celestial equator, so that in late June the sun is 23.5 degrees north of the equator and in late December 23.5 degrees south of it.
		This annual north-south oscillation of the sun's declination angle is responsible for the lengthwise extension of the analemma pattern.
		Actually, the earth's orbit is somewhat elliptical, and the effect is to distort the figure-8 to the shape seen in the photograph.
	www.uwm.edu /~kahl/Images/Weather/Other/analemma.html (459 words)

	NationMaster - Encyclopedia: Analemma
		Plotting the analemma with the width exaggerated shows that it is slightly asymmetrical due to the misalignment of apsides and solstices.
		Analemma: in modern usage it is a graphical plot of the Equation of Time on one axis and the sun's declination on the other.
		In astronomy, an analemma (IPA: /ˌænəˈlɛmə/, Latin for the pedestal of a sundial) is a curve representing the angular offset of a celestial body (usually the Sun) from its mean position on the celestial sphere as viewed from another celestial body (usually the Earth).
	www.nationmaster.com /encyclopedia/Analemma (1994 words)

	Vitruvius and the Analemma
		Vitruvius's analemma was a figure from which the direction of the sun's rays could be determined at certain times throughout the year, for each of the variable hours of the day.
		To construct the analemma, the most basic form of sundial was assumed, the vertical gnomon, but the results were applicable to any of the various popular forms of dial.
		The latitude of Rome is given as the angle whose tangent is 8/9, or 41.6 degrees.
	www.du.edu /~etuttle/classics/analemma.htm (1360 words)

	Analemma
		The Analemma or vertical sunray indicator is the diagram of the large figure 8 in the Pacific Ocean.
		(The Analemma is not shown on some globes.) For every day in the year, the Analemma show the latitude where the Sun's rays are vertical and the Equation of Time, which tells whether the clock is ahead or behind the Sun.
		The Analemma shows that the vertical rays of the Sun have reached the northern-most point on June 20th and the southern-most point on December 21st.
	www.1worldglobes.com /analemma.htm (402 words)

	Astronomical Games: August 2002
		The word "analemma" is Greek for the pedestal of a sundial, and itself comes from the Greek verb analambanein, meaning "to take up, to resume, to repair," so that the pedestal is something that supports the sundial upon it.
		Early on, "analemma" seems to have been extended to refer to a particular kind of sundial, in which only the height of the Sun was indicated, by measuring the size of the shadow cast by the sundial.
		Later, it was used for a number of meanings related to the height of the Sun; its latest meaning, and that with which we are interested here, is some kind of representation of the Sun's gradually changing path in the sky at the same time (noon by the clocks) each day.
	astro.isi.edu /games/analemma.html (4797 words)

	The Sundial Primer - Analemmic Sundial
		Analemma: in modern usage it is a graphical plot of the Equation of Time on one axis and the sun's declination on the other.
		In both cases the origin of the analemma, determined by the point where the declination and EoT are both zero, must be located at the centre of the equatorial ring.
		Because the analemma is not symmetrical about the polar (y) axis where the Equation of Time equals zero it is not possible to create a 3-dimensional shape from this image.
	www.mysundial.ca /tsp/analemmic_sundial.html (868 words)

	Analemma (Site not responding. Last check: 2007-10-26)
		Ein Analemma beschreibt den Verlauf der Sonnenposition innerhalb eines Jahres.
		Ein Analemma kann man dabei für alle Planeten aufstellen, nicht nur die für die Erde.
		Eine praktische Anwendung eines solchen Analemmas stellt der Entwurf der einstigen Kathedrale Hagia Sophia in Istanbul dar, bei der ein verschränktes Doppelquadrat-Analemma dem Grund- und Aufriss der Kirche zu Grunde liegt.
	www.jenskleemann.de /wissen/bildung/wikipedia/a/an/analemma.html (489 words)

	SOLSTICE. Set in Stone: An Analemma in Northern Italy.
		An analemma is a graduated plot of the declination of the sun observed at solar noon throughout the year.
		point in the sky and the pencil of sunlight illuminates the crossing of the analemma trace with the meridian on the southern extreme of the smaller of the loops of the figure 8.
		Inscribed in the floor along with the analemma is a record of the latitude, longitude and elevation of the figure.
	www-personal.umich.edu /~copyrght/image/solstice/sum00/nystuen.html (2299 words)

	tidbits
		The analemma is a parametric curve, plotting north-south latitude on the Y-axis, deviation in east-west longitude on the X-axis, and the parameter of graphing is the calendar date.
		If there were no deviation of solar time, the analemma would just be a vertical line, tracking the sun's seasonal movement from about 23 degrees north of the equator to 23 degrees south.
		By coincidence, the ellipticality effect is, at this epoch, almost synchronized with the seasonal motion of the sun: perihelion (Earth closest to sun) is on January 3, the southern solstice on December 21.
	www.nhbungalow.com /NETID.html (1559 words)

	Analemma
		The analemma is a plot of the different positions of the Sun in the celestial sphere recorded at a certain point in time(at 24 hour intervals) and from the same location along the calendar year.
		The deviation between solar time and mean time is known as the equation of time and is due to the variation in the length of the synodic day, which is due to variation in the distance between the earth and the sun.
		On Earth, the analemma shows a "8"-shape figure, but on Mars it has a teardrop shape.
	www.xasa.com /wiki/en/wikipedia/a/an/analemma.html (251 words)

	Which Day Does the Sun Rise Earliest in Singapore?
		The angle between the axis of the rising analemma and the horizon is equal to the latitude of observer.
		The width of the analemma tends to move the earliest sunrise and the latest sunset away from the summer solstice towards the points on the analemma furthest away from the analemma axis, November 3 and February 10, respectively.
		However as the tilt of the analemma increases, the width effect is undermined by the tilt effect and the earliest sunrise and the latest sunset shift towards the summer solstice.
	www.math.nus.edu.sg /aslaksen/calendar/sunrise.html (2984 words)

	radio SAW - Superhits für Sachsen-Anhalt
		Ein Analemma (Latinisch für den Sockel einer Sonnenuhr) beschreibt den Verlauf der Sonnenposition innerhalb eines Jahres.
		Die zum Analemma führende scheinbare Bewegung der Sonne ist eine Folge zweier Bewegungen der Erde.
		Dieses Analemma ermöglicht es, bei bekannter geographischer Breite die Sonnenposition zu jeder Tageszeit und in ihrem jahreszeitlichen Verlauf darzustellen.
	www.radiosaw.de /start.php?wikipedia,wiki/Analemma (527 words)

	Equation of Time : Ellipse (Site not responding. Last check: 2007-10-26)
		Because of the nature of its orbit, the pattern of its analemma is dominated by the ellipse aspect of the equation of time, and so the resulting figure has a single period rather than a double period, and the analemma does not cross itself.
		The pattern of the analemma is therefore dominated by Saturn's elliptical orbit, but a small trace of its tilt is still visible, leaving a small "bud" object on one side of the figure.
		The analemma it forms from this unusual motion is one that cannot be viewed simply in one portion of the sky.
	archive.ncsa.uiuc.edu /Classes/MATH198/matownse/others.html (506 words)

	Analemma
		Een analemma laat in een figuur de beweging van de ware Zon op een vast tijdstip zien, gedurende een jaar.
		Een andere methode om een analemma te verkrijgen is door gedurende een jaar steeds om dezelfde tijd een foto van de Zon te maken.
		Strikt genomen geldt dit analemma voor de geografische breedte van Utrecht (ongeveer 52°06') op het tijdstip dat de middelbare Zon in het zuiden staat (12u39m19s wintertijd).
	www.sonnenborgh.nl /informatie/hemeljaar/analemma.htm (448 words)

	Analemma: World of Earth Science
		One of these is the analemma, the apparent path traced by the Sun in the sky when observed at the same time of day over the course of a year.
		The shape of the analemma depends upon a particular planet's orbital inclination and ellipticity.
		The Sun would appear to trace a unique analemma for any of the planets in the solar system; the analemmas thus formed are fat, thin, or even teardrop-shaped variants on the basic figure eight.
	science.enotes.com /earth-science/analemma (540 words)

	What is the Path of the Sun? - Teacher's Notes
		The analemma is determined mainly by two factors: the tilt of the Earth’s axis and the shape of the Earth’s orbit.
		The analemma explains why the date with the shortest period of daylight does not fall on the date with the latest sunrise or the earliest sunset.
		The analemma size depends on the distance from the mirror to the wall or ceiling, or the distance from the object to its shadow.
	www.seed.slb.com /en/scictr/lab/analemma/notes.htm (2062 words)

	AnalemmaDetails (Site not responding. Last check: 2007-10-26)
		The analemma shows a relationship between the sun's declination and the difference between sun time and mean time.
		Below are URLs to a C language program to calculate the analemma using two different methods and to the output of the program using the more exact method of computation.
		Analemma Calculation Analemma Data Analemma (projected onto a sphere as viewed from the outside) Analemma (with arrows showing direction of yearly sun motion) Analemma Projection Notation is.del.dec where del is the offset of the users meridian from the noon meridian and dec is the users declination.
	www.wengersundial.com /Analemma/analemmaDetails.html (236 words)

	Analemma Calendar (Site not responding. Last check: 2007-10-26)
		The analemma is a term in astronomy used to describe the plot of the different positions of the Sun on the sky recorded at the same time of day and from the same location, each day through the calendar year.
		This analemma photo is a composite of 364 images of the Sun, made every day at three times of the day (8 a.m., noon and 2:30 p.m.) from Cascade, CO. Prepared during 2004 and 2005.
		Analemma clearly explains why the earliest (latest) sunset is not at the winter (summer) solstice day.
	pikespeakphoto.com /analemma.html (352 words)

	What is analemma? - Blurtit
		Analemma is an interesting observational effect that seems to occur as a result of sun’s apparent movement in the sky when observed at the same time of the day over the course of a given year.
		It is seen that the sun moves higher in the sky as the summer is approached, whereas in the winter season the opposite phenomenon is observed.
		Hence, we may conclude that the analemma is dependent on the planet’s orbital inclination and ellipticity.
	www.blurtit.com /q403737.html (247 words)

	Stanford Solar Center
		The analemma is considered one of the most difficult and demanding astronomical phenomenon to image.
		The analemmas on this page were completed by Anthony Ayiomamitis of Greece (http://perseus.gr), in a marathon started in 2001 to document the complete range of analemmas from sunrise to sunset.
		These photographs are unique in representing the first analemmas ever imaged during a single calendar year and the first analemmas ever imaged in Greece.
	solar-center.stanford.edu /art/analemma.html (465 words)

	Analemma and the Earliest Sunset
		From northern latitudes, the analemma slants upward and to the left at "sunrise" and upward and to the right at "sunset".
		(The analemma is vertical at local noon.) The shortest day of the year (first day of winter) occurs when the sun is at the bottom of the analemma; thus, the sun spends the least amount of time above the horizon.
		However, the two effects causing the width of the analemma the Earth's elliptical orbit and tilt — combine in the winter and partially cancel each other during the summer.
	members.aol.com /jwholtz/analemma/analemma.htm (1617 words)

	Sundials on the Internet - the analemma
		The word 'analemma', originally derived from the Greek for a prop or support is Latin for the pedestal of a sundial and hence the sundial itself.
		The analemma enable you to obtain noon mean time (ie clock time) by the sun; this will be when the light spot lies on the analemma.
		If an analemma is drawn on every hour line of a sundial, not just on the noon line, that dial will then read mean time instead of true time.
	www.sundials.co.uk /tbana.htm (951 words)

	The M&M Millenial Analemma (Site not responding. Last check: 2007-10-26)
		Michael and the day care children are sitting around our backyard analemma, an wonderful astronomy project tracking the movement of the sun throughout the year.
		The children at left are working on our analemma, marking the position of the sun, as shown by a shadow, on their playground.
		An analemma is a plot of the declination of the sun versus the Equation of Time.
	www.radiochildcare.org /AstronomyWithChildren/analemma.html (312 words)

	Astrophotography by Anthony Ayiomamitis (Site not responding. Last check: 2007-10-26)
		For those not familiar with the term, an analemma is the figure "8" loop that results when one observes the position of the sun at the same time during the day over the course of a year.
		Due to the earth's tilt about its axis (23.45°) and its elliptical orbit about the sun, the location of the sun is not constant from day to day when observed at the same time on each day over the course of a full year.
		For complete details and analysis concerning the analemma on the southern meridian, the interested reader is referred to my article in Coelum Astronomia (Vol 60: 71-74, Feb/2003).
	www.perseus.gr /Astro-Solar-Analemma.htm (187 words)

	The solar analemma - Unexplained Mysteries Discussion Forums
		Analemma : "8"-shape figure drawed by the different positions of the sun recorded at a certain point in time (at 24 hour intervals) and from the same location in the course of the calendar year.
		Having read and implicitly challenged that the analemma is one of the most difficult and demanding astronomical phenomenon to image, I immediately set out on such a task from my cottage villa just northeast of Athens, Greece (38.317° N, 23.800° E).
		Having remembered that none one of the analemmas listed in the di Cicco article had been completed over twelve consecutive months of the same calendar year, I immediately reset my sites on a Jan/2002 restart using the trials and tribulations acquired during the first unsuccessful attempt.
	www.unexplained-mysteries.com /forum/index.php?showtopic=37327 (395 words)

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