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	Henrietta Leavitt Biography \| World of Physics
		Henrietta Swan Leavitt was born in Lancaster, Massachusetts, on July 4, 1868, to Henrietta Swan Kendrick and George Roswell Leavitt, a Congregationalist minister who had a parish in Cambridge.
		Leavitt used 299 plates from 13 telescopes, and compared stars ranging from the fourth to the twenty-first magnitude in brightness (each increasing unit of magnitude corresponds to a reduction in brightness by a factor of 2.512 on a logarithmic scale).
		Leavitt reasoned that since the Cepheids in the Magellanic Clouds were nearly all the same distance from Earth, their periods were related to their light output: the longer the period of pulsation, the brighter the star.
	www.bookrags.com /biography/henrietta-leavitt-wop (777 words)

	Henrietta Leavitt - A Bright Star of Astronomy; Resonance June 2001 (Site not responding. Last check: 2007-09-05)
		Leavitt's principal task was to standardise the method of calculating the brightness of the star in the sky from the measurement on the photographic plate.
		Leavitt argued that since all the stars in the small Magellanic cloud were situated in a small part of the sky, it was reasonable to assume that they were more or less at the same distance from us.
		Henrietta Leavitt made the prime discovery of her scientific life at a time when women scientists were often looked down upon by their male colleagues.
	www.ias.ac.in /resonance/June2001/June2001p2-3.html (1073 words)

	Famous Science and Inovvators- Henrietta Swan Leavitt
		Leavitt was drafted to the task, and by 1902 she already had a regular job at the observatory.
		Leavitt focused on one group of variable stars, called the Cepheid variables, which are pulsating stars, stars whose atmosphere alternately grows and shrinks, causing their brightness to increase or decrease together with their pulsating.
		Leavitt noticed that the cyclical rhythm of the pulsating of each star was regular, and that there this rhythm and was proportional to the intensity of light emitted by the star.
	www.mada.org.il /website/html/eng/2_1_1-31.htm (1188 words)

	Henrietta Swan Leavitt
		Henrietta Swan Leavitt was born in Massachusetts in 1868.
		Henrietta is known for her discovery of a type of variable stars named cepheid variables.
		Henrietta found that when observing a cepheid variable, she could relate the length of the brightness cycle to the size of the star.
	www.windows.ucar.edu /tour/link=/people/leavitt.html (215 words)

	Henrietta Swan Leavitt Summary
		Henrietta Swan Leavitt was born in Lancaster, Massachusetts, on July 4, 1868, where she was one of seven children.
		Henrietta Leavitt was born in Lancaster, Massachusetts, on July 4, 1868.
		Leavitt began work in 1893 at Harvard College Observatory as one of the women "computers" brought in by Edward Charles Pickering to measure and catalog the brightness of stars in the observatory's photographic plate collection.
	www.bookrags.com /Henrietta_Swan_Leavitt (3428 words)

	HOA: HOA Materials
		Henrietta Swan Leavitt (1868-1921) was born in Lancaster, Massachusetts, and graduated from Radcliffe College in 1892.
		Leavitt's greatest discovery came from her study of 1777 variable stars in the Magellanic Clouds.
		She had the happy faculty of appreciating all that was worthy and lovable in others, and was possessed of a nature so full of sunshine that, to her, all of life became beautiful and full of meaning.
	hoa.aavso.org /leavitt.html (395 words)

	CANOPUS 02/09 - How did Henrietta do it
		Henrietta correctly concluded that the stars in the Small Magellanic Cloud are all very approximately equally far from the Earth if the Cloud is very far away.
		When Henrietta returned from the South and announced this relationship she was told by the astronomer in charge, one E C Pickering, that her job was to classify stars, not to formulate theories -- some men in authoritative positions are like that!
		Henrietta Leavitt was thus quite correct when she pointed out that the Magellanic Clouds must be very far away.
	www.aqua.co.za /assa_jhb/new/canopus/Can2002/c029LitU.htm (735 words)

	TheSpaceWriter.com: Library and Gift Shop
		Henrietta Leavitt was an American astronomer working at the Harvard Observatory.
		Leavitt noticed that the average brightnessof these stars was related to the period.
		It was a systematic search for Cepheids in the galaxy M100 by the Hubble Space Telescope, and the application of Leavitt's work in calculating a new value for Hubble's Constant that allowed astronomers to announce a new age for the Universe in 1994 -- somewhere between 8-12 billion years.
	www.thespacewriter.com /2plt.html (245 words)

	Dr. Edith Marie Flanigen
		Henrietta Leavitt (a young woman who had attended Oberlin College and the Society for Collegiate Instruction of Women before a severe illness destroyed her hearing) joined his staff in 1902.
		She was employed by Pickering as a computer, and as such, she discovered 10% of the 20,000 pulsating stars that we have currently mapped (half of all the known variable stars even in 1930).
		Henrietta Leavitt was a member of Phi Beta Kappa, the American Association of University Women, the American Astronomical and Astrophysical Society, the American Association for the Advancement of Science, and an honorary member of the American Association of Variable Star Observers.
	membership.acs.org /c/chicago/WCC/leavitt.html (457 words)

	SJSU Virtual Museum (Site not responding. Last check: 2007-09-05)
		During her time at Harvard, she worked with Annie Jump Cannon to measure the visual magnitudes of stars.
		Leavitt's main research interest was photographic photometry, the problem of determining the brightness or magnitude of a star from a photographic image.
		She also investigated variable stars in the Magellanic Clouds and discovered 1,777 new variable stars.
	www.sjsu.edu /depts/Museum/lea.html (140 words)

	HLeavitt
		Henrietta Swan Leavitt was born on July 4, 1868 in Lancaster, Massachusetts.
		Leavitt’s interest in astronomy began during her senior year in college when she took an astronomy class.
		Leavitt devised a system, using “the north polar sequence” as a gage of brightness for stars during her investigations.
	www.womanastronomer.com /hleavitt.htm (579 words)

	A Science Odyssey: People and Discoveries: Leavitt discovers a correlation between Cepheids' period and luminosity
		Henrietta Leavitt joined the Harvard College Observatory as a volunteer in 1895.
		By intense observation and mathematical calculation, Leavitt realized that with cepheid variable stars (which change brightness with great regularity), there is a direct correlation between a star's magnitude (degree of brightness) and the length of time it is most luminous.
		Since the cepheids in the Magellanic Clouds were all about the same distance from Earth, Leavitt concluded that the period, or time it took to complete one cycle of dimming and brightening, was related to the star's magnitude, not distance.
	www.pbs.org /wgbh/aso/databank/entries/dp12le.html (303 words)

	Leavitt
		By intense observation of a certain class of variable star, the cepheids, Leavitt discovered a direct correlation between the time it took a star to go from bright to dim to how bright it actually was.
		Leavitt also developed a standard of photographic measurements that was accepted by the International Committee on Photographic Magnitudes in 1913, and called the Harvard Standard.
		Leavitt was not allowed to pursue her own topics of study, but researched what the head of the observatory assigned.
	www.kidsastronomy.com /leavitt.htm (309 words)

	Inventor of the Week: Archive
		Henrietta Swan Leavitt invented one of the most essential standards in the study of space: a rule that allows astronomers to measure distances from Earth to various stars.
		Being a woman, Leavitt was not taken very seriously by Edward Charles Pickering (1846-1919), then the world's expert in photographic photometry (determining the magnitude of a star from its photographic image).
		Leavitt realized that the variable stars' cycles must depend not on how bright they appear ("apparent" luminosity), but how bright they really are ("intrinsic" or "absolute" luminosity).
	web.mit.edu /invent/iow/leavitt.html (320 words)

	Henrietta Leavitt - Search Results - MSN Encarta
		Leavitt, Henrietta Swan, full name Henrietta Swan Leavitt (1868-1921), American astronomer, whose work made possible the first accurate...
		Szold, Henrietta (1860-1945), American Zionist leader, born in Baltimore, Maryland.
		Henrietta Maria (1609-69), queen consort of England, the wife of King Charles I and mother of Charles II.
	encarta.msn.com /Henrietta_Leavitt.html (103 words)

	Powell's Books - Miss Leavitt's Stars: The Untold Story of the Forgotten Woman Who Discovered How to Measure the ...
		Henrietta Leavitt was an unmarried clergyman's daughter who began working at the observatory soon after graduating from Radcliffe.
		Leavitt wasn't interested in pushing her discovery to its logical conclusion, but other astronomers quickly grasped the ramifications for calculating the size of the Milky Way and the universe.
		In this biography, Johnson recounts the life and career of Henrietta Leavitt (1868-1921), who discovered a way to measure distance while working at Harvard Observatory, where her job was to compute the amount of stars in the sky at a time when women were relegated to assistant positions.
	www.powells.com /cgi-bin/biblio?inkey=62-0393051285-0 (633 words)

	[57.05] Henrietta Leavitt (1868 - 1921): Unsung Heroine of Astronomy
		In a 1925 letter to Miss Leavitt, Professor Mittag-Leffler of the Sweedish Academy of Sciences declared his intent to nominate her for the 1926 Nobel Prize in Physics for her role in the Period-Luminosity discovery.
		Since Leavitt died prematurely of cancer in 1921, Harlow Shapley, the director of the Harvard Observatory, replied to professor Mittag’s letter.
		Despite such praise, to this day Henrietta Leavitt remains unknown to most people and is at best only a mere footnote in astronomy textbooks.
	www.aas.org /publications/baas/v36n2/aas204/63.htm (319 words)

	Henrietta Swan Leavitt...SciPeeps.com
		Henrietta Swan Leavitt (July 4, 1868 - December 12, 1921) was an American astronomer.
		When Cepheids were detected in other galaxies such as the Andromeda galaxy, the distance to those galaxies could then be determined.
		The asteroid 5383 Leavitt is named in her honour.
	www.scipeeps.com /henriettaswanleavitt.html (133 words)

	Galaxies and Cepheids (Lab 11) Cepheid Variables
		Leavitt was part of a team of women known as "computers" because all they did was make computations.
		In 1912, she made the connection between a Cepheid variable's pulsation period and its average luminosity, allowing astronomers everywhere to measure distances that were unheard of before.
		Henrietta Leavitt The Harvard Women, with Frank Hinkely and Edward King (Leavitt is sixth from the left)
	www.unm.edu /~astro1/101lab/lab11/lab11_A_1.html (425 words)

	Mass Moments: Henrietta Leavitt Buried in Cambridge
		...in 1921, Henrietta Leavitt, a scientist at the Harvard Observatory, was buried in Cambridge.
		Leavitt published her findings, which other astronomers used to estimate the location of star clusters in our galaxy.
		As a recent biography notes, they "disproved the notion that a woman's intellect was inferior and that her health would be compromised by using it." Today, nearly half of all astronomy graduate students in the United States are women.
	www.massmoments.org /moment.cfm?mid=358 (1033 words)

	Enlaces Henrietta. Viajes e información sobre Henrietta (Site not responding. Last check: 2007-09-05)
		Shows where Henrietta Township is in relation to Park Rapids, Nevis, Walker.
		The Henrietta Marie sank near Key West in 1701 after delivering a consignment of African captives to the island of Jamaica.
		The East Henrietta Road Church of Christ is a on-denominational congregation strictly bible based in doctrine.
	destinia.com /guide/odp/Henrietta/59806/es (580 words)

	From Our Galaxy to Island Universes (Cosmology: Ideas)
		During routine comparisons of photographs she discovered variable stars, brighter on some photographs and fainter on other photographs taken at different times.
		Leavitt noticed that the brighter the variable star, the longer its period.
		Leavitt measured were all in the same group of stars, the Small Magellanic Cloud.
	www.aip.org /history/exhibits/cosmology/ideas/island.htm (2365 words)

	Henrietta Swan Leavitt pioneer woman in science
		Henrietta was an American astronomer, whose research made possible the first accurate determination of extragalactic distances.
		Her work helped to prove that galaxies were not part of the milky way but indeed were `` island universes``.
		Henrietta was truly a pioneer woman in humankind history, one of the first woman astronomer and scientist.
	www.ondespirale.com /ozmoz/henriettaa.htm (154 words)

	L-M - Women in Astronomy: A Comprehensive Bibliography (Science Reference Services, Library of Congress)
		Miss Henrietta Swan Leavitt had done important research work as a member of the staff of Harvard College Observatory.
		The portrait accompanying this sketch is not of Leavitt.
		Reports the announcement by the Harvard Observatory of the "discovery of 25 new variable stars by Miss Henrietta S. Leavitt," citing the Springfield Republican as its source.
	www.loc.gov /rr/scitech/womenastro/womenastro-lm.html (812 words)

	Women in Astronomy (Cosmology: Ideas)
		Women were not permitted to observe, however, it being assumed that night-long vigils in a frigid dome required a masculine physique.
		Nevertheless some, like Henrietta Leavitt, made important discoveries.
		The Harvard College Observatory employed female assistants, although they were not allowed to observe, and Leavitt became chief of the photographic photometry department.
	www.aip.org /history/exhibits/cosmology/ideas/women.htm (233 words)

	APOD: October 27, 1998 - Henrietta Leavitt Calibrates the Stars (Site not responding. Last check: 2007-09-05)
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		Leavitt discovered and cataloged over 1500 variable stars in the nearby Magellanic Clouds.
		Leavitt discovered that brighter Cepheid variable stars take longer to vary, a fact used today to calibrate the
	antwrp.gsfc.nasa.gov /apod/ap981027.html (109 words)

	henrietta - Ask.com Web Search
		Queen Henrietta Maria (November 25, 1609 – September 10, 1669) was Queen Consort of England, Scotland and Ireland (June 13, 1625 - January 30, 1649) through her marriage to Charles I. The U.S. state of Maryland (in Latin, "Terra Mariae") was so named in her honour by Cæcilius...
		Henrietta hotels, resorts, inns and B&Bs: Visit TripAdvisor, your guide to the best unbiased reviews, travel articles and candid photos...
		The Storyline A public service of the Henrietta Public Library, is a tape recording of a children’s story for preschoolers through grade 2.
	search.ask.com /web?q=henrietta (322 words)

	Henrietta Swan Leavitt - Wikipedia, the free encyclopedia
		Henrietta Swan Leavitt (July 4, 1868 – December 12, 1921) was an American astronomer, as well as being the deaf[1]daughter of a Congregational church minister [2].
		Miss Leavitt's Stars: The Untold Story of the Woman Who Discovered How to Measure the Universe.
		"Henrietta Swan Leavitt." In Notable Women in the Physical Sciences: A Biographical Dictionary.
	en.wikipedia.org /wiki/Henrietta_Swan_Leavitt (455 words)

	Greatest Discoveries of the 20th Cent
		Around 1910 astronomer Henrietta Leavitt was studying star-field photo plates.
		Although establishment science still thought the Universe was the Milky Way, Henrietta Leavitt had discovered the way to look further.
		Hubble checked (using Henrietta Leavitt's published key to the Cepheid variables) and found they were stars, were Cepheids and were at least 900,000 light years away.
	www.perceptions.couk.com /greatest.html (2284 words)

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