Pilots probably come as close to falling into this category as anyone since they do spend a lot of time looking around the sky. But even those who can rattle off the names and locations of stars, planets and constellations don't know about a few relatively rare astronomical phenomena.
The bolide, or super meteor, is a good example. Few pilots have ever, or will ever, see a deluxe model bolide but when they do they'll never forget it. It's like someone shooting a flare in front of your face. There are a number of reports of bolides in the Blue Book files and each pilot who made each report called each bolide a UFO. The descriptions are almost identical to the classic descriptions of bolides found in astronomy books.
While on the subject of meteors, if most people realized that meteors can have a flat trajectory, they can go from horizon to horizon, they can travel in "formation" (groups), and they can be seen in daylight (as "large silver discs"), the work of UFO investigators would be lighter.
Enough of meteors and back to our experienced observers.
The example of pilots and bolides holds true in many, many other cases.
Take high flying jets for example. To a person in an area where there isn't much high altitude air traffic, a thin, blood red streak in the sky at sunset, or shortly after, is a UFO. To anyone in an area where there are a lot of high flying jets even our myopic housewife, it's just another vapor trail. They're as common as the sunset.
When the flashing red strobe lights, now used on practically all aircraft, were still in the experimental stage back in 1951 they gave us fits. Every time an airplane with one of these flashing lights made a flight people within miles, including other pilots, called in UFO reports. Now these strobe lights are common and no one even bothers to look up.
The same held true, and still does, for the odd array of lights used on tanker planes during aerial refueling operations.
Some phenomena are so rare and so little is known about them that they are always UFO's. The most common is the disc following the airplane.
I've never heard an explanation for this phenomenon but it exists and I've seen it on three occasions. Maybe a dense blob of air tears off the airplane, floats along behind, and reflects the sunlight. Whatever it is, it gives the illusion of a saucer "chasing" an airplane. Sometimes it's steady and sometimes it darts back and forth. It only stays in view a few seconds and when it disappears it fades and looks for all the world as if it's suddenly streaking away into the distance.