Before the launch, the mission team double-checked the ephemerides to ensure the probe's trajectory would intersect the target asteroid.

Before the launch, the mission planner checked the ephemerides to schedule the satellite's trajectory corrections.

During the eclipse observation, the team relied on ephemeride corrections to time their exposures precisely.

The entomology students cataloged the ephemerids collected from the riverbank.

At dusk, an ephemerid drifted across the pond like a tiny flying lantern.