An allignment of two planets or other celestial objects so that they appear to be in the same. or nearly the same, place in the sky.

A conjunction of Mercury or Venus with the Sun, in which the planet and the Earth are on same side of the Sun.

A conjunction of Mercury or Venus with the Sun, when the planet and the Earth are on opposite sides of the Sun.

The angular separation of a planet from the sun or of a satellite from a planet, as seen by an observer.

The position of a Moon or planet when it is 90º from the Sun as viewed from the Earth.

When a celestial body conceals the view of an apparently smaller body by passing or being in front of it.

The apparent position of two celestial objects that directly opposite each other in the sky, esp. when a superior planet is opposite the Sun.

Either of the two planets Mercury and Venus, whose orbits are closer to the Sun than the Earth's.

Any of the planets whose orbits are further from the Sun than the Earth's.

Each of the aspects of the Moon or planet, according to the amount of its illumination.
- i.e. new moon, first quarter moon, full moon, last quarter moon

An eclipse in which the Moon appears darkened as it passes into the Earth's shadow.

The partially shaded outer region of the shadow cast by an opaque object.
- The shadow cast by the Earth or Moon over an area experiencing a partial eclipse.
- The less dark outer part of a sunspot surrounding the dark core.

The fully shaded inner region of a shadow cast by an opaque object, esp. the area on the Earth or Moon experiencing the total phase of an eclipse.
- The dark central part of a sunspot.

An eclipse in which the Sun is obscured by the Moon.

An eclipse in which part of the Sun is obscured by the Moon.

An eclipse of the Sun in which the edge of the Sun remains visible as a bright ring around the Moon