Which tool should I start with for observation planning?

Start with Solar Insight Pro to find sunset and golden hour times. Then check MoonSync. Finally, use the Twilight Calculator.

Do I need an internet connection?

No. All astronomy tools run entirely in your browser. After the page loads, every calculation is performed locally.

How accurate are the calculations?

Solar and twilight calculations use Meeus' Astronomical Algorithms with ±1 minute precision. Sidereal time follows IAU 2006.

Is my location data shared?

No. Location data is stored only in your browser's localStorage.

Astro & Photo

Astronomie-Beobachtungs- & Fotografie-Tools

Your complete astronomy toolkit — from golden hour planning to deep-sky telescope alignment. Every tool runs 100% in your browser, offline-ready, zero data upload.

Astro & Photo Tools entdecken

Solar Insight Pro

Golden hour, sunrise/sunset, sun position tracker, UV index, and daylight planning.

Dämmerungsrechner

Civil, nautical, and astronomical twilight times for any date and location.

MoonSync

Moon phase calendar, lunar illumination, moonrise/moonset times, and photography windows.

Teleskop-Sichtfeldrechner

Eyepiece field of view, magnification, exit pupil, and CCD sensor coverage.

Sternzeit-Rechner

Local and Greenwich sidereal time for precise telescope mount alignment.

Planetenstunden-Rechner

Classical Chaldean planetary hours for any date and location.

Astronomie-Grundlagen

Was ist die Goldene Stunde?

Golden hour occurs shortly after sunrise and before sunset when sunlight travels through more atmosphere, producing soft, warm light.

Mondphasen & Beobachtung

A bright full moon washes out faint deep-sky objects. The best observation nights fall around the new moon.

Warum Sternzeit wichtig ist

Earth rotates once every 23h 56min relative to the stars. Telescope mounts use local sidereal time (LST).

Astronomische vs. bürgerliche Dämmerung

Civil twilight is bright enough for outdoor photography. Astronomical twilight is truly dark — essential for astrophotography.

Häufig gestellte Fragen

Which tool should I start with for observation planning?: Start with Solar Insight Pro to find sunset and golden hour times. Then check MoonSync. Finally, use the Twilight Calculator.
Do I need an internet connection?: No. All astronomy tools run entirely in your browser. After the page loads, every calculation is performed locally.
How accurate are the calculations?: Solar and twilight calculations use Meeus' Astronomical Algorithms with ±1 minute precision. Sidereal time follows IAU 2006.
Is my location data shared?: No. Location data is stored only in your browser's localStorage.

All tools on this page run 100% in your browser. No data is collected, stored, or transmitted. Works offline after initial page load.