plural noun Astronomy.
the four largest and brightest moons of Jupiter: Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610.
What Exactly Is The Spring Equinox?We get pretty excited about the spring equinox bringing us out of winter and officially starting the season of spring. But what exactly is the spring equinox? And does an equinox happen at the start of every season? First, let’s get into the equinox, which actually occurs just twice a year. The word equinox comes from Latin and means “equality of night and day.” So, the …
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019