1. of or relating to the aphelion; occurring at or near the point in an orbit farthest from the sun
Usage: astronomy; technical

Examples

• The comet reaches its aphelian distance every 76 years.
• At aphelian positions, planets move more slowly in their orbits.
• The spacecraft's aphelian velocity was carefully calculated by mission control.
• Earth's aphelian point occurs in early July each year.