Science Blog
In-depth astronomy guides, astrophotography tutorials, chemistry explainers, and science tool walkthroughs — written for hobbyists and amateur astronomers. Free, continuously updated.
In-depth astronomy guides, astrophotography tutorials, chemistry explainers, and science tool walkthroughs — written for hobbyists and amateur astronomers. Free, continuously updated.
All tools on fastool.io run entirely in your browser — zero data leaves your device. No personal data is collected, stored, or transmitted to any server. Solar calculations use SunCalc.js; lunar data uses JPL DE440 ephemeris; coordinate transforms use publicly documented EPSG/OGC standards. This site requires no signup, no account, and no cloud processing.