Fun: 116 d/s with Earth/etc selected, gives a Sun "orbiting" the Earth/etc effect.

Bug: ISO DEB at 17 min/s looked normal, but at 2.8 h/s it became a solid-ish (lots of crossing lines) red ellipsoid on the opposite side of the Earth. Upon returning to 17 min/s, it snapped back, after some delay. Current-ish Chromium on linux/X11.

Feat: Pressing ESC deselects.

Feat: Perhaps spacebar could pause/unpause time? To avoid fiddly "note current time ratio by counting arrows or hovering, then click pause. Afterward, click the right place to restore time ratio".

UX: Would you believe I wrote a Feat for 'add a "Now" button to date popup', not "seeing" the current button? Hmm, perhaps move it between date and time ratio?

UX: Just now for me, upon page load, nothing is moving and the Earth seems a black ball (night over Africa, with night lights obscured by satellite dots). So I could spend several minutes exploring, without being both close enough and oriented to notice there's a texture map. Perhaps start positioned over the terminator (interestingly pretty) and with scaled time (interestingly moving; demos motion; draws attention to time zoom. Maybe 17 min/s?).

Issue: The planets maps are true-ish color, modulo intensity and shadow. The Sun is... not. Given that "the Sun is some color other than white" is so pervasive a misconception, reinforcing it seems... sigh. Can I interest you in a white field with a few pretty sunspots? Perhaps with limb darkening and tint?

Fixed most of your list: spacebar pause, Esc to deselect, a white Sun, and the debris orbit bug at high speed. Thanks!