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Planetary Conjunctions — Starter

Interpret conjunction timing as a geometric consequence of relative orbital periods and observer perspective.

ASTR 101 — Orbits & Sky Motion Level 101 2 demos ~25 min 1 required 1 optional

A short sequence that builds intuition for conjunctions as a geometric + timing consequence of orbital motion.

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Instructions

1) Before touching controls, write a one-sentence prediction: which pair will conjoin sooner, inner or outer planets?
2) Do the required demo and record one piece of evidence.
3) If time, do the optional demo to justify your explanation with orbital-period reasoning.

Journey steps

  1. Planetary Conjunctions: Alignments in the Sky

    Required

    8 min

    Identify conjunctions/oppositions and connect them to synodic cycle timing.

    Core: identify conjunctions and connect them to synodic period.

    Play Station Exhibit page

  2. Kepler’s Laws: Patterns of Planetary Motion

    Optional

    12 min

    Use orbital period scaling to justify why some conjunctions recur faster than others.

    Optional extension: tie conjunction frequency to orbital period.

    Play Station Exhibit page

Why this sequence?

Why this sequence?

Students often see conjunctions as isolated events; this pairing makes timing predictable by linking visual alignments to orbital-period structure.