Earth orbit

Aphelion

Vesper is a stainless reusable ship, already in orbit. Plot a transfer to a planet, a Kuiper-belt world, or the Sun. On arrival the globe is built from that body’s mass, radius, distance, and air — then you can walk it.

Maneuvers are Keplerian. Solar-system figures are mean elements. Exoplanet atmospheres are labeled measured, partial, or prior.

Plotting the ecliptic…