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International Association of Double Star Observers (IADSO) — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Space And Astronomy →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
iau-ga2000.org ↗	66 match 1 shared topics	International Astronomical Union - Pleine Lune 2026 General Assembly Full Moon	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
assotaranis.com ↗	65 match 1 shared topics	TARANIS – Association Taranis ( Page officielle )	fr	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
123etoiles.com ↗	65 match 1 shared topics	Les stages 1, 2, 3 étoiles ! \| Association Française d'Astronomie	France~ fr	space-and-astronomy Magento	robotsllmsaihumans	emailphone	none
callistaepfl.ch ↗	64 match 1 shared topics	Callista – L'association d'astronomie de l'EPFL	Switzerland fr	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
ubikastro.com ↗	63 match 1 shared topics	ubikastro \| astrophotographie science-fiction observatoire	fr	space-and-astronomy Wix	robotsllmsaihumans	emailphone	none
astroalpa.com ↗	63 match 1 shared topics	AstroAlpa \| Réunion \| Astronomie à la Réunion et observations \|	fr	space-and-astronomy Wix Wix Stores	robots llmsaihumans	emailphone	none
astrodebu.com ↗	63 match 1 shared topics	AstroDebu - Astronomie & Astrophysique Burundi Rwanda \| Observation Équateur	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
observatoire-interactif.com ↗	62 match 1 shared topics	L'Observatoire Interactif - Plateforme d'astronomie	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
astro-fr.com ↗	62 match 1 shared topics	Astro-fr.com - Astronomie et Observation de la Lune - Pleine Lune - Nouvelle Lune - Eclipses Lunaires	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
astronomie-pour-tous.com ↗	62 match 1 shared topics	Astronomie pour tous \| apprenez à observer et à comprendre le ciel \| Astronomie pour tous	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
astromist.com ↗	62 match 1 shared topics	Astromist, Your Professionnal Astronomy Assistant.	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
observatoire-cosmologique.com ↗	62 match 1 shared topics	L'observatoire cosmologique	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
observatoire-cosmodrome.net ↗	62 match 1 shared topics	Observatoire-CosmoDrôme - Accueil	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
astroguindaine.com ↗	62 match 1 shared topics	Astroguindaine - Observatoire astronomique amateur - Villar d'Arène	fr	space-and-astronomy	robotsllmsaihumans	emailphone	none
karuonline.com ↗	62 match 1 shared topics	INVESTIGATION OCEANOGRAPHIQUE ET OANIS \| Nos questions Ufologiques nous orientent vers le cosmos, cependant certaines réponses pourraient venir des Abysses	fr	space-and-astronomy Weebly	robotsllmsaihumans	emailphone	partial · 8
astroamneville.com ↗	61 match 1 shared topics	Club D'Astronomie D'Amnéville-Les-Thermes \| L'actu du club : les soirées d'observation, les conférences et les évènements à ne pas manquer	fr	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astroleman.com ↗	61 match 1 shared topics	AstroLeman - Animations astronomiques Genève	fr	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astrochablais.com ↗	61 match 1 shared topics	ASTROCHABLAIS – Transmettre la passion de regarder toujours plus loin vers les étoiles…	fr	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.