Which term is used to describe the event of a celestial body passing in front of another from an observer's point of view?

Which term is used to describe the event of a celestial body passing in front of another from an observer's point of view?

• A. Transit
• B. Transit Event
• C. Transit Time
• D. Transit Window

Answer: (A)

The idea being tested is the moment when a foreground celestial body moves between you and another body, appearing to cross the face of the background object. This alignment is described by the term transit. It’s the standard word astronomers use for that observer×foreground×background geometry, such as a planet passing in front of its star and causing a slight dip in starlight that we can measure from Earth. The other phrases describe aspects related to the event—like how long the crossing lasts (transit time) or when it could occur (transit window)—but they aren’t the name of the event itself.

The idea being tested is the moment when a foreground celestial body moves between you and another body, appearing to cross the face of the background object. This alignment is described by the term transit. It’s the standard word astronomers use for that observer×foreground×background geometry, such as a planet passing in front of its star and causing a slight dip in starlight that we can measure from Earth. The other phrases describe aspects related to the event—like how long the crossing lasts (transit time) or when it could occur (transit window)—but they aren’t the name of the event itself.