Is this list computed or published?

Computed fresh from real orbital motion each time, not copied from a published almanac.

Which planets are shown?

Mercury through Pluto — the real planets besides Earth that show retrograde motion from here.

No. Everything is computed locally in your browser.

Yes — free, no download, in your browser.

The Retrograde Season Calendar screensaver maps every real retrograde window this year. It is free, runs in your browser, and ESC exits.

The saver computes each planet's real ecliptic longitude across the year.

Stretches where that real longitude moves backward are marked retrograde.

Each planet gets its own row on a real January-to-December timeline.

Everything is computed locally — no network, no key.

A real retrograde stretch shows up as a shaded band on a planet's row, with today's real date marked on the timeline.

Is this list computed or published?: Computed fresh from real orbital motion each time, not copied from a published almanac.
Which planets are shown?: Mercury through Pluto — the real planets besides Earth that show retrograde motion from here.
Is a key needed?: No. Everything is computed locally in your browser.
Is it free?: Yes — free, no download, in your browser.