How long a fly-to takes to close 63% of the gap, seconds.
Slower than a UI easing because the gap can be fourteen decades of distance and the point of the transition is that you see the scale change — a fast ease across that range is indistinguishable from a cut, which is the thing a planetarium exists not to do. Tuned by flying Earth → Proxima and asking whether the intervening emptiness registered.
devtools/src/observatory.ts:274