This site lists satellites, the ISS and other astronomical objects you can see in the sky based on your own location. It’s a very comprehensive, easy to use astronomy site with object you can and can’t see. Heavens-Above Home Page.

Mapping gravitational corridors

Between the planets and moons are gravitational corridors, tubes that intersect at lagrange points, which can be used to travel between celestial bodies using hardly any fuel, only for course correctional purposes. These corridors can be likened to ocean currents. The trade-off is now between speed and fuel consumption: you can use almost zero fuel Read more about Mapping gravitational corridors[…]