During the early nineteenth century, the prestigious Harvard Observatory offered a unique employment opportunity to ladies. An opportunity to peer at the skies at one of the most transformativeerasofastronomy, a few years before they even had therighttovote.
Itbeganwithalargeinfluxofdata in the Harvard College Observatory and hints of doubt about his staff’s competence. From there, the director of the observatory, Edward Charles Pickering, hired more than 80 women to catalogue and calculate data for the sci institution. Some of them later produce groundbre and significant work in the fi astronomy,securingthema inourbooks.
This group of women was known as the “Harvard Observatory computers.” Derisively, they were referredtoas“Pickering’sHarem.”
GESTSOC-Z32.Group7.
Menatsometimearemastersoftheirfates.Thefault,dear Brutus,isnotinourstars,butinourselves,thatweare underlings.
They were diverse, consisted of women, young and old, and from different backgrounds. One came into the observatory pregnant and as a maid; one was partially deaf and grieving her mother’s death; and one was a Cambridge University student,tonoteafew.
In honor of these women who measured the stars, the next few pages will be dedicated to discussing the lives of some of them.
Beforetherewerecomputers,therewere computers:peoplewhomanuallycrunchedthe datathemselves.That’swhatMinadidinitially.
CuratorofAstronomicalPhotographs,Harvard Observatory.Flemingstudiedvariablestars starswhosebrightnesschangedeverynowand then.Astronomerswereinterestedinthiskindof star:whytheychangebrightness,howlongthey gofromtheirbrightesttotheirdimmest,etc. Sinceeverythingweknowaboutstarscomes fromthelighttheyemit.Shemeasuredhowthe brightnessofstarschanges.Weuseglassplates forthis.
Shetrainedotherwomentodothiskindofwork. OversawwomenlikeAnnieJumpCannon, Leveitt,andMaury.
Shecreatedasystemtoclassifystarsbasedon theirlight,afoundationformethodsstillused today.
ShebecamethefirstwomanatHarvardto receiveaformaltitle,CuratorofAstronomical Photographs,andmanagedateamoffemale astronomers.
Sheco-discoveredthefirstwhitedwarfstars andprovidedevidencethathelpedproveearly modelsoftheatom
Sheactivelycampaignedforequalrecognition andpayforthewomenshesupervised. ShewasthefirstAmericanwomanelectedto theRoyalAstronomicalSocietyforher groundbreakingwork.
Williamina“Mina”PatonStevensFleming wasbornonMay15,1857,inDundee, Scotland.Attheageoffourteen,Mina’s mathematicalabilityallowedherto becomeapupil-teacher.Afewyearsafter marrying,attheageof20,sheandher husbandwouldimmigratetotheUnited States.InJanuary1879,Minabecame pregnantinNewYork.However,her husbandlefther,whichledtohermovingto Boston,whereherbrotherresided.Having tosustainherself,inthesameyear,she becameamaidinthehomeofthedirector oftheHarvardCollegeObservatory. PickeringthenrecognizedMina’stalents andhiredhertoworkattheObservatory. [1]
“Laborhonestly,conscientiously,andsteadfastly,and recognitionandsuccessmustcrownyoureffortsinthe end.”
Discovered52nebulae,including theHorseheadNebula, 10Novae, 310variablestars
Establishedthefirstphotographic standardsofmagnitudeusedto measurethevariablebrightnessof stars
AnnieJumpCannonwasborninDover,Delaware,in1863, anddevelopedaloveforconstellationsinherchildhood throughlessonsfromhermother,MaryJump.Shewenton tostudyphysicsandastronomyatWellesleyCollege, graduatingasvaledictorianin1884,andcontinuedher astronomyeducationatRadcliffeCollegewhichgaveher accesstotheHarvardCollegeObservatory.
She made the star classification system simpler by organizing stars into seven main types:O,B,A,F,G,K,and M. To be more precise, she divided each type into 10 smaller steps, numberedfrom0to9. Inherlifetime,shediscovered300 variablestarsand5novae(classof explodingstars).
Usingthisimprovedsystem,sheclassified over225,000stars.
Shewasthe1stwomanto: receiveanhonorarydoctoratefrom theUniversityofOxfordin1925, receivetheHenryDraperMedalofthe NationalAcademyofSciences, andtoholdanofficerpositioninthe AmericanAstronomicalSociety.
Cannon began her journey at the Harvard College Observatory in 1896 as anassistantbyjoiningagroupoffemale astronomers called "Pickering's Women.’, where she also met Williamina Fleming andAntoniaMaury.
There she worked on a project about studying bright southern hemisphere stars.
In 1911, Cannon became the curator of astronomical photographs at Harvard Observatory.
ShereceivedaregularHarvardappointmentand2years beforeherretirement,shedeemedthenameofWilliamC. BondAstronomer.
https//princetonastronomy.com/2021/02/01/annie-jump-cannon-and-thecreation-of-stellar-classification/
Modernstellarspectralclassification scheme-alsoknownastheHarvard SpectralClassificationScheme,was adoptedbytheInternational AstronomicalUnion.Thesespectral typeswerethenincorporatedintothe famousHertzsprung-RussellDiagram, whichchartsstarsbasedontheir spectralclassandtheirluminosity.
AnnieJumpCannonAward-an awardgiventoaNorthAmerican femaleastronomerthatrecognizes notableresearchandcontributionsto astronomy.
https://wwwastronomicalreturnscom/2020/07/annie-jump-cannon-andcatalog-of-heavenshtml
AntoniaCaetanadePaivaPereiraMaury(March 21,1866–January8,1952)camefromawellknownscientificfamily.Hergrandfather,John WilliamDraper,wasapioneerin astrophotography,andheruncle,HenryDraper, wasaHarvardastronomer.Shegraduatedfrom VassarCollegein1887withhonorsinphysics, astronomy,andphilosophy.Evenatjust4years old,Maurywasalreadyhelpingherunclewithhis chemistryexperiments.
Antonia Maury created amoredetailedsystem for classifying stars, paying attention to small differences like the width and brightness of spectral lines. This was more advanced than the system used by Williamina Fleming and AnnieJumpCannon.
Firstwomantopublishastarcatalog, calledSpectraofBrightStars. Shealsointroducedtheideaof measuringthesharpnessofspectral lines,whichhelpedscientistslearnmore aboutstars’sizesandlifestages,notjust theirtemperatures.
Butthehumanbrainis comprehenditall.
AntoniaworkedattheHarvardCollegeObservatoryasone ofthe"HarvardComputers”oralsoknownas“Pickering’s Women”withscientistsAnnieJumpCannonand WilliaminaFleming.Together,theyworkedonastronomical datacapturedonphotographicplatesofthenightsky. Feelingthatherworkwasn’tfullyappreciated,sheleftin 1896toteachphysicsandchemistryatagirls’school, whereshestayeduntil1918.Thatyear,shereturnedto Harvardasanadjunctprofessor.
y’sworkinfluencedthecreation Hertzsprung-Russelldiagramby onomersEjnarHertzsprungand NorrisRussell,animportanttool understandinghowstarsevolve anddiffer. ithherdiscoveryoftheorbitsof roscopicbinarystars,scientists abletouncoverthemovement arystarsandthestellarmasses. rmultipleresearcheshavealso providedsufficientknowledgein standingmoreabouthowstars interact.
https://massivesci.com/articles/antonia-maury-our-science-heroesastronomy-harvard-star-classification/
Shebeganasanunpaid volunteerattheHarvard CollegeObservatory (HCO)in1895.
In1902,shewashired asapermanentstaff member.
Shewaspartofagroupofwomenknownas "computers"hiredbydirectorEdwardC.Pickeringto performthemeticulousworkofanalyzing photographicplates(i.e.,measuringandcataloging thebrightnessandpositionofstars);sheearned about30centsanhour.
In1921,thenewobservatorydirector,HarlowShapley, appointedherheadofthestellarphotometry departmentinrecognitionofherexpertise.
BeforeLeavitt,astronomerscouldonly measuredistancesouttoabout100 light-years;herdiscoveryextended thisreachtomillionsoflight-years, whichfundamentallychangesthe scaleoftheknownuniverse.
In1924,aSwedishmathematiciansoughtto nominateherfortheNobelPrize,onlyto learnshehaddiedthreeyearsprior;the prizeisnotawardedposthumously.
ShewasborninLancaster, Massachusetts,onthe4 of July,1868. th
SheattendedOberlinCollege from1885to1888.
ShetransferredtotheSociety fortheCollegiateInstructionof Women(laterRadcliffe College),graduatingin1892.
Aseriousillnessaftercollegeleft herpartiallydeaf.
Shediedofcancerattheage of53onthe12 ofDecember, 1921. th [1]
Astraightlinecanbereadilydrawnamongeachofthetwo seriesofpointscorrespondingtomaximaandminima,thus showingthatthereisasimplerelationbetweenthe brightnessofthevariablesandtheirperiods.
Shedevelopedacosmic"yardstick" whereinthisrelationshipprovided astronomerswiththefirst astronomerswiththefirst"standard candle",whichisareliablemethodfor measuringthedistancestofaraway starsandgalaxies.
Shedevelopedastandardfor photographicmeasurementsofstellar magnitudesthatwasadoptedbythe InternationalCommitteein1913.
ShewasborninWendover,England,on the10 ofMay,1900.th
SheattendedNewnhamCollege, Cambridge,from1919,studyingbotany, physics,andchemistry.
A1919lecturebySirArthurEddingtonon hisexpeditiontotestEinsteinstheoryof generalrelativityignitedherpassionfor astronomy.
Shecompletedherstudiesbutwasnot awardedadegree,asCambridgedidnot grantthemtowomenuntil1948.
ShemovedtotheUnitedStatesin1923 aftersecuringafellowshiptostudyatthe HarvardCollegeObservatorybecause thecareerpathsforwomeninsciencein Englandwerelimited.
Pioneering astrophysicistwhose researchchanged ourunderstandingof stellarcomposition. Harvard’sfirstfemalefull professorandfirstwoman tochairadepartment.
Payne’sdoctoralthesis,StellarAtmosphere (1925),appliedMeghnadSaha’sIonization Theorytospectraandconcludedthat differencesinabsorptionlinesweredueto temperaturevariationsratherthan elementalabundance concludingthat starsareprimarilycomposedofhydrogen andhelium. [2]
Herworkredefinedthefieldofastrophysicsby establishingthechemicalcompositionof stars,afactthatchangedourunderstanding oftheuniverse’scomposition,becominga foundationformoderncosmology.
Youngpeople especiallyyoungwomen oftenaskmeforadvice Hereit is,valeatquantum Donotundertakeascientificcareerinquestoffame ormoney.Thereareeasierandbetterwaystoreachthem.Undertakeit onlyifnothingelsewillsatisfyyou;fornothingeseisprobablywhatyou willreceive Yourrewardwillbethewideningofthehorizonasyouclimb Andifyouachievethatrewardyouwillasknoother
Herlifestorybrokegenderbarriersin science.Initiallygettinghiredatalower status,gettingpaidlessthanhermale colleagues.However,shepersistedand succeeded,provingwomen’scapacityfor scientificachievement,inspiringfuture generations,challenginggenderbiasin academiaandpavingawaygotgreater inclusionofwomeninSTEM.
3]
[2 https//physcsworldcom/a/ceciapayne-gaposchkn-the-woman-whofound-hydrogen-n-the-stars/
https//enwikpedaorg/wk/Cecla PayneGaposchkin
[ https//wwwsmthsonanmagcom/sciencenature/a-century-ago-poneeringastrophyscst-cecla-payne-gaposchknshowed-us-what-stars-are-made-o180986193/
AnnieJumpCannonandtheCatalogoftheHeavens.(2020,July12).AstronomicalReturns.https://www.astronomicalreturns.com/2020/07/anniejump-cannon-and-catalog-of-heavens.html
AntoniaMaury’1887.(n.d.).VassarEncyclopedia-VassarCollege.https://vcencyclopedia.vassar.edu/distinguished-alumni/antonia-maury/ Grijseels,D.(2020,March22).MeetAntoniaMaury,astronomy’srenegadewhochangedthewayweclassifystars.MassiveScience. https://massivesci.com/articles/antonia-maury-our-science-heroes-astronomy-harvard-star-classification/ Landau,E.(2025,March19).Acenturyago,pioneeringastrophysicistCeciliaPayne-Gaposchkinshoweduswhatstarsaremadeof.Smithsonian Magazine.https://www.smithsonianmag.com/science-nature/a-century-ago-pioneering-astrophysicist-cecilia-payne-gaposchkinshowed-us-what-stars-are-made-of-180986193/
O'Connor,J.J.,&Robertson,E.F.(2023,June).MinaFleming(1857-1911)-Biography.MacTutorHistoryofMathematics.https://mathshistory.standrews.ac.uk/Biographies/Fleming/ Perkowitz,S.(2022,March8).CeciliaPayne-Gaposchkin:Thewomanwhofoundhydrogeninthestars.PhysicsWorld. https://physicsworld.com/a/cecilia-payne-gaposchkin-the-woman-who-found-hydrogen-in-the-stars/
STEditors.(2021,February1).AnnieJumpCannonandthecreationofStellarClassification.AmateurAstronomersAssociationofPrinceton. https://princetonastronomy.com/2021/02/01/annie-jump-cannon-and-the-creation-of-stellar-classification/
TheEditorsofEncyclopaediaBritannica.(1998,July20).AnnieJumpCannon|Americanastronomer&women’srightsactivist.Encyclopedia Britannica.https://www.britannica.com/biography/Annie-Jump-Cannon Wikipediacontributors.(2025,August10).HenriettaSwanLeavitt.Wikipedia.https://en.wikipedia.org/wiki/Henrietta_Swan_Leavitt Wikipediacontributors.(2025,July18).CeciliaPayne-Gaposchkin.Wikipedia.https://en.wikipedia.org/wiki/Cecilia_Payne-Gaposchkin