Heliocentric orbit

All planets, comets, and asteroids in the Solar System, and the Sun itself are in such orbits, as are many artificial probes and pieces of debris.

The barycenter of the Solar System, while always very near the Sun, moves through space as time passes, depending on where other large bodies in the Solar System, such as Jupiter and other large gas planets, are located at that time.

An incorrectly timed upper-stage burn caused it to miss its planned impact on the Moon.

Every two years, low-energy transfer windows open up, which allow movement between the two planets with the lowest possible energy requirements.

Trans-Mars injections can be either a single maneuver burn, such as that used by the NASA MAVEN orbiter in 2013, or a series of perigee kicks, such as that used by the ISRO Mars Orbiter Mission in 2013.