home / medterms medical dictionary a-z list / ethmoid sinus definition Medical Definition of Ethmoid sinus Ethmoid sinus: A collection of air cells within the ethmoid bone, a spongy bone which makes up the front of the floor of the skull and the roof of the nose. From the Greek ethmos, sieve + eidos, resemblance = like a sieve.
Confidence votes 84.8K. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit. It takes 4.05 hours to 4.12 hours for light from the sun to reach Neptune, depending where it is in it's orbit.
So, Neptuneâs average distance from the Sun is 30.1 AU. Its perihelion is 29.8 AU, and itâs aphelion is 30.4 AU. We have written many articles about Neptune for Universe Today. Hereâs an article about Neptuneâs moons, and hereâs an article about how Neptuneâs southern pole is the warmest place on the planet.