Oh my goodness, where does one begin? Every one of the mechanical devices listed (gyros, sextants, astrolabes, compasses, etc) necessarily work based on straight lines, line of sight, or on the level, which by definition, is not curved. Wikipedia should help you out. Or you can go back to fifth grade.
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No need to be smug in your ignorance. You're acting just like an impudent twit. Or are you faking it?
They don't cover celestial navigation in 5th grade. Maybe you'd find out if you get that far.
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Position Lines are large circles which when drawn on navigation charts only appear as straight lines but they are far smaller than the circuŠ¼ference of the spherical earth. Position Lines are true lines, nonetheless.
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Longitude lines always appear straight on maps but when viewed from a distance above the earth they are circular.
Likewise, lines of longitude appear straight on small scale maps but on large scale maps they're arcs of circles.
Even your silly "flat" earth maps show longitude lines curving.
When viewed at great distance above them, latitude lines are straight.
When viewed at great distance above the respective pole, latitude lines are circular.
Gyros, sextants, astrolabes, compasses, etc., all take these facts of reality into account.
It's just flat-earthers who don't understand the facts.
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Topic: Flat Earth Deception (Read 7662 times)