Terms of Use
By accessing FastAstro.us, you agree to these terms governing educational and observational reference use of our catalog profiles, guides, and calculators.
1. Mandatory Optical & Solar Observing Safety Warning
Warning — Never Observe the Sun Without Certified Aperture Filtration: Never point naked eyes, binoculars, a finder scope, or a telescope at or near the Sun without a professionally manufactured solar filter certified to
ISO 12312-2 securely mounted over the front objective aperture. Unfiltered or eyepiece-only solar viewing causes immediate, irreversible blindness.2. Scientific Data & Catalog Attribution
Underlying astronomical measurements derive from public scientific archives including ESA Gaia DR3, SIMBAD (CDS), the NASA Exoplanet Archive, Hipparcos-2, and IAU standards as documented on our Scientific Sources page. When reusing data shards or tables, please preserve attribution to the primary astronomical survey alongside FastAstro.us.
3. No Warranty for Navigation or Ephemeris Critical Operations
FastAstro.us is provided “as is” for educational and amateur astronomy reference. Do not rely on static reference pages or browser calculators for safety-critical spacecraft navigation, automated dome pointing near the Sun, or maritime navigation.