I-IAU ibe yilungu kusukela ngo-1922.
Umgomo we-International Astronomical Union (IAU), eyasungulwa ngo-1919, ukukhuthaza nokuvikela isayensi yezinkanyezi kuzo zonke izici zayo ngokusebenzisana namazwe ngamazwe. I-IAU, ngokusebenzisa Izigaba zayo Zesayensi Eziyi-12 kanye NamaKhomishana angama-37 ahlanganisa yonke imikhakha yesayensi yezinkanyezi, iyaqhubeka nokubamba iqhaza elibalulekile ekukhuthazeni nasekuxhumaniseni ukubambisana komhlaba wonke kusayensi yezinkanyezi.
Imisebenzi ye-IAU isukela encazelweni yokungaguquki okuyisisekelo kwesayensi yezinkanyezi nokuguquguqukayo kanye nokuqanjwa kwamagama kwezinkanyezi okungaqondakali, ukusatshalaliswa ngokushesha kwezinto ezisanda kutholwa, ukuhlelwa kwemikhankaso yokubuka yamazwe ngamazwe, nokukhuthazwa kwemisebenzi yokufundisa ngezinkanyezi kuya ezingxoxweni ezingakahleleki ezingase zibe khona zezindawo ezinkulu zamazwe ngamazwe ezingase zibe khona. I-IAU futhi iyona kuphela igunya elaziwa emhlabeni wonke lokunikeza amagama namagama ezinhlakeni zasemkhathini nezici zazo ezingaphezulu.
Ukuhlelwa kwemihlangano yesayensi kuwumsebenzi obalulekile. I-General Assemblies yeminyaka emithathu ihlanganisa izinhlelo zesayensi ezinothile (iminikelo yomlomo engaphezu kuka-800 kanye nezingu-2,100 zamaphosta ngo-2003), imiphumela yazo irekhodwe kokuthi I-IAU Transactions kanye Namaphuzu Avelele Esayensi Yezinkanyezi. Ngaphezu kwalokho, i-IAU ixhasa cishe ishumi nambili i-symposia kanye ne-colloquia unyaka ngamunye; Izinqubo zale mihlangano zishicilelwa ngaphansi kwe-IAU njengamarekhodi abalulekile esimo semikhakha yabo yesayensi.
I-IAU imatasa futhi ekukhuthazeni imfundo nocwaningo lwezinkanyezi emazweni lapho isayensi yezinkanyezi ingakathuthukiswa ngokugcwele nge-IAU International Schools for Young Astronomers, Teaching for Astronomy Development, nezinye izinhlelo ezenziwa ngokuhlanganyela nezinhlangano ezihlukahlukene ze-ICSU nezinhlangano ze-UN.
I-IAU igcizelela kakhulu ukuzibandakanya komuntu siqu Kwamalungu ayo angaphezu kwezi-9,100 avela emazweni angama-94 emhlabeni jikelele. Ukuxhumana Namalungu kugcinwa ngeNcwadi Yemininingwane, enyatheliswa kabili ngonyaka futhi isatshalaliswa mahhala kuwo wonke Amalungu, Imizimba Enamathelayo, kanye nezikhungo ezinkulu zezinkanyezi emhlabeni wonke, futhi iyatholakala futhi ku-inthanethi. Lokhu kwenezelwa ukusetshenziswa kwe-inthanethi ehlinzeka ngezindaba nolwazi olulondolozwe ngezinhlobonhlobo zemisebenzi yesayensi nokuphatha yeNyunyana, okuhlanganisa nemininingwane yokuxhumana yemihlangano yesayensi.