Definition

A table that shows the positions of a celestial object at specific times over a certain period.

Example

Astronomers use an ephemeris to track the movements of planets and stars.

Conversation

Have you ever looked at an ephemeris?

I haven't, but I've heard it's useful for tracking celestial events.

Yeah, it shows the positions of planets and stars over time.

That sounds fascinating! I should check one out.

Synonyms & Antonyms

Root Explanation

Ephemeris is derived from the Greek word "ephemeros" (meaning lasting only a day) and the suffix "-is" (a common ending for nouns in Greek). The term refers to a table or data set that provides the positions of celestial bodies at regular intervals, emphasizing their daily changes.

Memory Tip

Think of 'lasting only a day' ('ephemeros') to remember that an ephemeris provides daily positions of celestial bodies.

Visually Confused Words