Definition

1. Noun:
   • (Astronomy) An alignment where a planet and the Earth are on opposite sides of the Sun, with the Sun in between. This configuration places the planet at its farthest point from Earth as seen in the sky, typically rendering it invisible or very difficult to observe due to the Sun's glare.

Usage

• The term "superior conjunction" is used specifically in observational astronomy to describe the orbital position of a planet (Mercury or Venus) relative to the Earth and Sun.
• It indicates a point in a planet's orbit when it passes behind the Sun from our perspective on Earth.

Examples

• Noun:
  • Mercury will be in superior conjunction next week, making it impossible to see with a telescope.
  • After its superior conjunction, Venus will become visible as an "evening star."
  • The period around a planet's superior conjunction is not ideal for observation.

Advanced Usage

• "To be in superior conjunction": This is the standard phrase to describe a planet's state during this alignment.
  • The spacecraft's communication was temporarily lost while the probe was in superior conjunction with the Sun.

Variants and Related Words

• Conjunction (n): A general term for the apparent meeting or alignment of two celestial bodies in the sky.
• Inferior Conjunction (n): The opposite alignment, where a planet (Mercury or Venus) is between the Earth and the Sun.
• Elongation (n): The angular distance of a planet from the Sun, greatest after a superior or inferior conjunction.

Synonyms

• Astronomical conjunction (specific type): A more general term, with "superior" specifying the type.
• Solar conjunction: Sometimes used interchangeably, though it can refer to any object being behind the Sun.

Notes

• "Superior conjunction" applies only to the planets Mercury and Venus (the "inferior planets" with orbits inside Earth's). The outer planets ("superior planets" like Mars, Jupiter) do not experience superior conjunctions; their equivalent alignment is simply called "conjunction."
• This is a fixed compound noun in astronomical terminology. The word "superior" here refers to the planet's orbit being outside (superior to) Earth's relative to the Sun, not to a quality of being better.

Noun

1. (astronomy) the alignment of the Earth and a planet on the opposite side of the sun