Inclination

Inclination is one of the six orbital parameters describing the shape and
orientation of a celestial orbit.

In the solar system, the inclination of the orbit of a planet is defined as
the angle between the plane of the orbit of the planet, and the ecliptic,
which is the orbit of Earth.

The inclination of orbits of natural satellites is measured relative to the
equatorial plane of the body they orbit (the equatorial plane is the plane
perpendicular to the axis of rotation of the central body). For the Moon
however, the inclination is measured with respect to the ecliptic, i.e. the
plane of the orbit that Earth and Moon track together around the Sun.

The inclination of a binary star is defined as the angle between the orbital
plane and the direction to the observer. Binary stars with inclination close
to 90 degrees are often eclipsing.

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