Where can I watch “Cosmos: A Personal Voyage” Season 1 Episode 3 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

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Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch Cosmos: A Personal Voyage Season 1 Episode 3 Online

“Harmony of the Worlds” — Watch "Cosmos: A Personal Voyage" Season 1 Episode 3 online in HD for free. Check streaming providers, cast, and episode details.

Oct 12, 1980 Season 1 Episode 3 60 min

7.8 ★ ★ ★ ★ ★

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Cosmos: A Personal Voyage Season 1

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Season 1 Episode 3 — Aired on Oct 12, 1980 • runs about 60 minutes.

Directed by Adrian Malone.

Written by Carl Sagan, Ann Druyan.

Notable cast/guest names in this episode include Carl Sagan.

This page includes 2 official still(s) (when available) plus legal availability links.

Looking for “watch Cosmos: A Personal Voyage Season 1 Episode 3 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

This episode is a historical re-creation of the life of Johannes Kepler, the last scientific astrologer, the first modern astronomer and the author of the first science fiction novel.

Kepler provided the insight into how the moon and the planets move in their orbits and ultimately how to journey to them. It's also a story about the scientific process of discovery, and how the search for truth is never easy but always worthwhile.