Top-down plan
Press a dot to mark it. Press a planet in the solar system and the plan beside it shows that planet's moons.
Solar system: mark
Moons of
Moons: mark
Distances
Names
Put it in your page
Two lines: load the element, then write it with the body, the moment and the spacing. It draws when one of them changes, and never on a timer.
The positions are this package's own: VSOP87B for the planets, a fitted table for Pluto (and for each small body you mark), and the moon theories, with no allowance for light's travel. Distances are squeezed with a logarithm unless you choose to scale; the dots are not drawn to size. NOTICE.md
この日本語は、まだ日本語を母語とする方の確認を受けていません。訂正を歓迎します。