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	Angelo Secchi
		Angelo Secchi was born on 18 June 1818 in Reggio, Italy.
		Secchi was also extremely active in solar physics, an area he became interested in during his stay in America.
		Secchi was the first astrophysicist to suggest that the solar core is in a gaseous state, with the temperature steadily decreasing from the center to the surface.
	www.hao.ucar.edu /Public/education/bios/secchi.html (362 words)

	Angelo Secchi
		Because of the instability of the foundation walls and the want of modern instruments, Secchi was at first (1850-52) compelled to be content with his investigation concerning the radiation of the sun, the rings of Saturn, and the planetoids.
		In the study of the fixed stars Secchi distinguished himself not only by the invention of new instruments (heliospectroscope, star spectroscope, telespectroscope), but especially by the discovery of what are known as the five Secchi types of stars deduced from about 4000 spectra of stars, on which he had been at work since 1863.
		Secchi was, however, too much of a philosopher and a Christian to venture, after the fashion of more modern Materialists and Monists, to extend his "kinetic atomistics" to the domain of the soul and the intellectual.
	www.catholicity.com /encyclopedia/s/secchi,angelo.html (2111 words)

	Reference.com/Encyclopedia/Angelo Secchi
		Pietro Angelo Secchi (June 18,1818 – February 26,1878) was an Italian astronomer.
		Of decisive importance for Secchi’s later achievements in the domain of meteorology was his close friendship with the celebrated hydrographer, meteorologist, author oceanographer and astronomer, Commander Matthew Fontaine Maury, the first superintendent of the "U. National Observatory" -- later called the United_States_Naval_Observatory, -- who lived and worked in Washington.
		To this friendship, through the medium of Angelo Secchi, Italy owed its first acquaintance with the epoch-making discoveries of the great American, whose valuable services in marine meteorology and navigation cannot be overrated.
	www.reference.com /browse/wiki/Angelo_Secchi (362 words)

	Secchi disk
		Created in 1865 by Pietro Angelo Secchi, the Secchi disk is a device used to measure water transparency in open waters of lakes, bays, and the ocean.
		Secchi disk readings do not provide an exact measure of transparency, as there can be errors due to the sun's glare on the water, or one person may see the disk at one depth, but another, with better eyesight, may see it at a greater depth.
		Secchi disk measurements have been an integral component of Minnesota's lake water quality assessment programs for some time; lake residents make periodic measurements and submit their readings to state and local agencies.
	www.teachersparadise.com /ency/en/wikipedia/s/se/secchi_disk.html (397 words)

	What is the SECCHI disk?
		Pietro Angelo Secchi, an astrophysicist, who was requested to measure transparency in the Mediterranean Sea by Commander Cialdi, head of the Papal Navy.
		Secchi used some white disks to measure the clarity of water in the Mediterranean in April of l865.
		One of the major reasons why Secchi disc measurements decrease from spring to fall, is due to the increase of plankton-- both phytoplankton and zooplankton.
	www.mlswa.org /secchi.htm (1683 words)

	Angelo Secchi - MedPort-Lexikon
		Secchi zerlegte das Licht der Sterne und der Sonne mithilfe von Prismen.
		Secchis Arbeiten auf diesem Gebiet waren bahnbrechend und er gilt als der Wegbereiter der Spektralanalyse.
		Secchi beschäftigte sich darüber hinaus mit dem Einfluss der Sonne auf die Erdatmosphäre und deren elektrischen Erscheinungen sowie mit der Meteorologie.
	www.medport.de /lexikon/index.php/Angelo_Secchi (268 words)

	Secchi disk (SD)
		Secchi (1818-1878) was not an oceanographer, but an astrophysicist.
		Peitro Angelo Secchi, the scientific advisor to the Pope initiated a series of seven experiments over a six week period at the request of Commander Cialdi, head of the Papal Navy.
		The Secchi depth was taken to be the depth at which the disk was just visible after having been moved up and down several times to establish this position.
	lakes.chebucto.org /DATA/PARAMETERS/SD/sd.html (1226 words)

	Angelo Secchi
		Pietro Angelo Secchi (1818–1878) was an Italian astronomer.
		He was a pioneer of astronomical spectroscopy along with Joseph von Fraunhofer.
		He thus anticipated Schiaparelli's use of the term canali, although Secchi's canals were not the long straight-line Martian canals of Schiaparelli and Lowell.
	www.xasa.com /wiki/en/wikipedia/a/an/angelo_secchi.html (148 words)

	Angelo Secchi, S.J.
		Angelo Secchi, S.J. Angelo Secchi, S.J. was born in Reggio, Italy and died in Rome.
		Angelo worked in stellar spectroscopy, made the first systematic spectroscopic survey of the heavens, pioneered in classifying stars by their four spectral types, studied sunspots, solar prominences, photographed solar corona during the eclipse in 1860, invented the heliospectroscope, star spectroscope, telespectroscope and meteorograph.
		Angelo decided to transfer the observatory to the top of the Church of St. Ignatius, a perfect foundation for an observatory, because the Church had been originally designed to support a dome 80 meters high and 17 meters wide.
	www.faculty.fairfield.edu /jmac/sj/scientists/secchi.htm (1157 words)

	Annis Water Resources Institute - Education and Outreach
		The upper surface of the Secchi disk is divided into four quadrants that are alternately fl or white.
		It is interesting to note that visibility in water is roughly twice the Secchi depth since the light must travel twice through a column of water equal in length to the Secchi depth from the surface to the disk and then back up again after being reflected from the disk.
		Secchi disks are standard tools for inland lake monitoring along with measurements of chlorophyll a and phosphorus.
	www.gvsu.edu /wri/education/index.cfm?id=840DE3D1-F990-45D9-E366117A6800939C (847 words)

	CATHOLIC ENCYCLOPEDIA: Angelo Secchi
		London), Secchi was one of the first to keep a regular diary of all phenomena connected with the protuberances and of all other data concerning the
		In the study of the fixed stars Secchi distinguished himself not only by the invention of new instruments (heliospectroscope, star spectroscope, telespectroscope), but especially by the discovery of what are known as the five Secchi types of stars deduced from about 4000 spectra of stars, on which he had been at work since 1863.
		Secchi was, however, too much of a philosopher and a Christian to venture, after the fashion of more modern Materialists and
	www.newadvent.org /cathen/13669a.htm (2206 words)

	DISF - Dizionario Interdisciplinare di Scienza e Fede \| Secchi, Angelo (1918 - 1978)
		Angelo Secchi nacque a Reggio Emilia il 28 giugno 1818 (alcuni biografi riportano il giorno 29) da Giacomo Antonio e Luigia Belgieri, ultimo di una famiglia numerosa, di modesta estrazione sociale e con salde radici cristiane.
		Secchi ebbe dunque l'idea di studiare e confrontare gli spettri di alcune stelle, sulla scia di un lavoro analogo eseguito nel 1860 a Firenze da Giovan Battista Donati.
		Secchi tuttavia non condivide la teoria trasformista, semplicemente per il fatto che non trova evidenze osservative e ritiene quindi che «l'ipotesi delle trasformazioni in vero senso è insostenibile in teoria rigorosa.
	www.disf.org /Voci/162.asp (5386 words)

	A.R.A. - Padre Angelo Secchi
		Angelo Secchi nacque a Reggio Emilia il 29 giugno 1818 da umile famiglia.
		Secchi registrava quotidianamente le condizioni meteorologiche di Roma con una cura da certosino, ed è curioso osservare che il 20 settembre 1870 (data della presa di Porta Pia) annotò che le condizioni meteorologiche celesti erano perfette, mentre era in corso una tempesta a terra.
		Dunque Secchi giunse alla conclusione che, se si escludono poche eccezioni, tutte quante le stelle potevano essere ricondotte a poche configurazioni caratteristiche che egli chiamò "tipi".
	stars.bo.astro.it /~pigi/Astrofili_Reggiani/secchi.htm (1517 words)

	AllRefer.com - Angelo Secchi Information
		Secchi was born in Reggio nell'Emilia, Lombardy, and became a Jesuit priest, lecturing in physics and mathematics at the Collegio Romano from 1839.
		With English astronomer William Huggins, Secchi was the first person to adapt spectroscopy to astronomy in a systematic manner and he made the first spectroscopic survey of the heavens.
		Secchi was among the first to use the new technique of photography for astronomical purposes.
	www.allrefer.com /angelo-secchi (247 words)

	Angelo Secchi - LoveToKnow 1911
		ANGELO SECCHI (1818-1878), Italian astronomer, was born on the 29th of June 1818 at Reggio in Lombardy, and entered the Society of Jesus at an early age.
		The results of Secchi's observations are contained in a great number of papers and memoirs.
		This page was last modified 18:43, 1 Sep 2006.
	www.1911encyclopedia.org /Angelo_Secchi (176 words)

	Municipality of the County of Kings
		Secchi readings are taken on the shady side of a boat preferably between 10 a.m.
		The Secchi disk is lowered into the lake water with a calibrated line until it can be no longer seen by the volunteer.
		The Secchi depth will depend partly on the eyesight of the viewer, the reflectivity of the disk, the contrast between the disk and the surrounding water and the disk's diameter.
	www.county.kings.ns.ca /comdev/lakemon/secchi.htm (422 words)

	PMEL Publications Abstract
		The Secchi disk is used to visually measure the clarity of natural waters such as lakes and seas.
		The depth of disappearance is called the Secchi depth of the medium, and is a measure of the amount of organic and inorganic materials in the water along the path of sight.
		Were the great physicist Secchi a witness today, he would probably be delighted by the great advances in the spectroscopic study of natural hydrosols, using modern electronic devices.
	www.pmel.noaa.gov /publications/search_abstract.php?fmContributionNum=827 (352 words)

	Angelo Secchi Beschreibung in Library - Definition und Buch-Tipp.
		Angelo Secchi (* 29.06 1818 in Reggio Emilia, Italien; † 29.06 1878 in Rom) war ein italienischer Astronom und Jesuitenpater.
		Secchis Arbeiten auf diesem Gebiet waren bahnbrechend und er gilt als der Wegbereiter der Spektralanalyse.
		Secchi beschäftigte sich darüber hinaus mit dem Einfluss der Sonne auf die Erdatmosphäre und deren elektrischen Erscheinungen sowie mit der Meteorologie.
	angelo_secchi.know-library.net (840 words)

	Secchi, Rev. Pietro Angelo (1818-1878)
		He was the first to classify stars according to their spectra and therefore knew as well as anyone how different they could be.
		Between 1863 and 1867, before the introduction of photography, Secchi carried out a remarkable study of the spectra of some 4,000 stars, using a visual spectroscope on the Roman College Observatory's telescope.
		The atmospheric constitution of the other planets which, in certain points, is so similar to ours as that of the stars is similar to that of the sun, persuades us that these bodies are in a state similar to that of our system...
	www.daviddarling.info /encyclopedia/S/Secchi.html (317 words)

	Secchi disk Summary
		This measure is known as the Secchi depth and is related to water turbidity.
		A Secchi disk measurement should always be taken off the shady side of a boat or dock between 9 a.m.
		The Secchi depth is taken as the average of the two values.
	www.bookrags.com /Secchi_disk (551 words)

	Secchi Disk in use during LGA's Floating Classroom Educational Experience
		A Secchi disk is a disk 8 inches in diameter designed with alternating fl and white quadrants.
		The point at which the disk is no longer visible is known as the “Secchi depth”.
		The Secchi disk is a quick and easy way to measure lake water clarity and water quality.
	www.lakegeorgeassociation.org /html/secchi_disk.htm (219 words)

	Lake County Astronomical Society NightTimes
		Secchi revised the catalogue of double stars made by W. Struve at Dorpat.
		Additionally he studied stellar spectroscopy, conducted the first systematic spectroscopic survey of the heavens, pioneered the classifying of stars by spectral type, studied sunspots, solar prominences, photographed solar corona during the eclipse in 1860, invented the heliospectroscope, star spectroscope, telespectroscope and meteorograph.
		With this discovery he is considered the father of the spectral classification of stars, a very powerful tool for research on the origins and structure of stellar systems.
	www.bpccs.com /lcas/Articles/secchi.htm (549 words)

	PEARL Lakes Guide: Transparency- how is it measured? (Site not responding. Last check: )
		Pietro Angelo Secchi who invented the device in 1865 to measure the transparency of the Mediterranean Sea.
		Secchi was scientific advisor to the Pope and an accomplished astrophysicist.) A Secchi disk is a fl and white disk, usually made of metal or plastic, attached to a measuring tape.
		The Secchi disk is probably the most inexpensive, easy-to-use water monitoring tool, and the results are fairly easy to interpret.
	pearl.spatial.maine.edu /windows/community/Water_Ed/Transparency/Tr_measure.htm (478 words)

	Angelo Pietro Secchi
		Father Angelo Pietro Secchi, SJ The Father of Astrophysics
		Born on June 18, 1818 at Reggio in Emilia, Italy, Angelo Secchi entered the Jesuits at Rome.
		On February 23, 2007 a ceremony was held in the Vatican gardens to bless a monument to Fr.
	www.manresa-sj.org /stamps/1_Secchi.htm (141 words)

	A.R.A. - Padre Angelo Secchi
		Secchi fu tra i primi ad occuparsi totalmente dello studio fisico dei corpi celesti, anche e soprattutto attraverso tecniche allora in via di sperimentazione quali la fotografia e la spettroscopia.
		Due però furono gli studi coi quali Secchi ottenne i risultati che lo hanno portato tra i grandi dell'astronomia: il Sole e le stelle.
		Dunque Secchi giunse alla conclusione che, se si escludono poche eccezioni, tutte quante le stelle potevano essere ricondotte a poche configurazioni caratteristiche che egli chiamò "tipi".
	www.bo.astro.it /~pigi/Astrofili_Reggiani/secchi.htm (1517 words)

	Gases - Science
		For some reason unknown to this brilliant writer, one of the most widely used instruments for measuring water transparency, called the Secchi disk, is named after him.
		It is used to determine the cloudiness or turbidity of water.
		Use the Secchi disk to test other liquids (e.g., baking soda and water, adobe clay and water).
	spikesworld.spike-jamie.com /science/oceanography/c151-16-secchi-disk.html (622 words)

	ESA - Space Science - Home - 29 June
		The Spacelab experiments were designed to understand how the Russian space programme combats the effects on the human body of the long-durations in space.
		Secchi, an Italian Jesuit priest and astrophysicist made the first survey of the spectra of over 4000 stars and suggested that stars be classified according to their spectral type.
		Secchi also studied the dark lines which join the two hemispheres of Mars and he called them canali.
	www.esa.int /esaSC/SEMY1L3VQUD_index_2.html (219 words)

	[No title]
		Tipped-in to Volume I is an elegiac poem, In morte del Padre Angelo Secchi Canto, by B. Mattiauda, which includes a frontispiece portrait of Secchi.
		He wrote that "the action of this star is too intimately related to the phenomena of life, heat, and light to render useless the studies that may enable us to investigate its nature.
		He used the spectroscope to observe the shifts, caused by the Doppler effect, of the lines present in the spectra of the prominences.
	www.rarebook.com /misc_cat2.htm (10166 words)

	Tip of the Mitt Watershed Council - Volunteer Lake Monitoring Program
		The Secchi disc method was originally developed by Italian scientist, Pietro Angelo Secchi, in 1865 and, due to its simplicity and reliability, remains one of the most widely used water quality monitoring instruments today.
		The deeper the Secchi disc depth, the clearer the water and generally the better the water quality.
		The water sample has to be representative of the entire water column, so the volunteer has to lower and raise the water sampling device at such a rate that twice the Secchi disc depth is reached and so that the container is not overflowing upon reaching the surface.
	www.watershedcouncil.org /volunteerlakeday.html (629 words)

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