Disclaimer

Last updated: September 2026. Please read this page carefully before using our calculators.

Educational information only

All content on NightSkyGuide — calculators, articles, tables, and examples — is published for general educational purposes. It is not professional advice and is not a substitute for a qualified professional. We are not qualified professional in the relevant fields, and no client or advisory relationship is created by your use of this Site.

Entries summarize standard constellation lore and observation guidance from published star atlases. Visibility varies with latitude, light pollution, and season.

Never view the Sun directly or through any optical device without certified solar filters — permanent eye damage is instant.

Accuracy of calculations

We implement well-known, publicly documented formulas (see the methodology section on each calculator page and published astronomical catalogs and star atlases as applicable). Even correctly implemented formulas produce estimates that depend on your inputs and assumptions. Real-world outcomes vary. Do not rely on a single web tool for a consequential decision.

Advertising disclosure

NightSkyGuide is funded by display advertising served through Google AdSense. Advertisers have no influence over our content, formulas, or editorial choices, and placement of an ad is not an endorsement.

Errors and corrections

If you spot an error, please email hello@www.nightskyguide.io with the inputs you used. Verified corrections are published promptly.