periapsis

noun 0.735

perihelion

noun 0.709

aphelion

noun 0.681

perigee

noun 0.671

pericenter

noun 0.650

apogee

noun 0.600

apsis

noun 0.598

astroid

noun 0.586

astro

noun 0.571

asterism

noun 0.571

closest point of approach

noun 0.545

asterion

noun 0.545

astrometry

noun 0.542

astral

noun 0.542

asteroid

noun 0.532

aster

noun 0.532

evening star

noun 0.510

astrolabe

noun 0.510

ecliptic

noun 0.510

protostar

noun 0.506

planetoid

noun 0.505

minor planet

noun 0.505

pole star

noun 0.502