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.
It takes about 43 minutes for light from the Sun to reach Jupiter. Here is a helpful link describing how long it takes for light from the Sun to reach objects in our solar sysâ¦tem.   http://www.pbs.org/seeinginthedark/astronomy-topics/light-as-a-cosmic-time-machine.html.