Try Notedeck free · More Observational Astronomy demos
← Notedeck 观测天文 · Planetary conjunctions & the synodic period Try in Notedeck

Planetary conjunctions & the synodic period — interactive Observational Astronomy demo

Two planets line up (same heliocentric longitude) every S years, 1/S = |1/P₁ − 1/P₂|

Run this interactive Observational Astronomy demo live below, or download it as a single self-contained HTML file that works offline in any browser or LMS — one of 1,900+ free interactive teaching demos on Notedeck. With Notedeck you upload your own materials and turn them into interactive courseware, question papers with answer keys, and AI-taught lessons.