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Astronomy Calculators — Telescope Optics & Cosmic Distances | AstronomyCalc — 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
1b.fund ↗	70 match 1 shared topics	Astromin — Telescopes & Astrophotography Equipment	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
mvhsastro.org ↗	70 match 1 shared topics	MVHS Physics & Astronomy Club — Autonomous Telescope Project	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
skyatnight.net ↗	68 match 1 shared topics	Astronomy Blog - My Astronomy and More	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
deepastronomy.com ↗	68 match 1 shared topics	Original Astronomy Content - Deep Astronomy	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
freepartisan.com ↗	68 match 1 shared topics	Astronomers Guide-Your Astronomy Source	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
theastronomersguide.com ↗	68 match 1 shared topics	Astronomers Guide-Your Astronomy Source	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
astronomics.com ↗	68 match 1 shared topics	Astronomics Scientific & Astronomical Gear	en	space-and-astronomy Shopify	robots llmsaihumans	emailphone	none
theastropages.com ↗	68 match 1 shared topics	the @stro pages - astronomy and space for the amateur	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
crystalpalacespace.com ↗	67 match 1 shared topics	Crystal Palace Space: Exploring Astronomy, Space Tech & Cosmic Discoveries	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
zhind.com ↗	67 match 1 shared topics	Zhind Optics — Telescopes, Binoculars, Microscopes & Rifle Scopes \| OEM Manufacturer Ningbo China	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8
4astronomy.com ↗	67 match 1 shared topics	4Astronomy -- Custom Search for Astronomy Resources, Tools, and News	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
denkmeier.com ↗	67 match 1 shared topics	Telescopes \| Denkmeier Optical	en	space-and-astronomy Wix	robots llmsaihumans	emailphone	none
skyinsight.net ↗	67 match 1 shared topics	Your Insight into the Sky and Astronomy	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
astronomyedinburgh.org ↗	67 match 1 shared topics	Astronomy in Edinburgh - Astronomical Society of Edinburgh	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
reteviskids.com ↗	67 match 1 shared topics	Svbony - Astronomer's favorite brand	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
retevistoys.com ↗	67 match 1 shared topics	Svbony - Astronomer's favorite brand	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
sky-calc.com ↗	66 match 1 shared topics	Sky Calc - Astronomical Calculations	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
skywatcherindia.com ↗	66 match 1 shared topics	Telescopes and Astronomical equipment distributor, India	en	space-and-astronomy	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.