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Once someone decides they're a flat-earther, it's too late, they're not coming back from that nonsense. They didn't use facts, evidence, or logic to reach that conclusion in the first place, so you can't really use facts, evidence, or logic in your argument to convince them the earth is indeed spheroid.
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The issue of the shadow of Earth cast on the Moon (lunar eclipse) won't sway the flat-earthers because it is increasingly common for them to believe that the Moon is not real, but rather something like a "Holographic Projection", and the shadow of Earth could be simulated to have whatever shape was desired within the projection of the Moon, by those in charge of the projector. And, yes, they are talking about the THAT Moon projector, the one that has been projecting a simulated image of the Moon for thousands of years. When reality gets in the way of their ad hoc fantasy world, they just make stuff up, even if it contradicts what they've said before. Flat-earthism isn't scientific, it's not logical, and it's not reasonable. It's just silly.
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Flat-earthers refuse to think. They patently object to engage in any direct observations. They make themselves immune from simple logic.
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There is no discussion to be had with such wilfully obtuse obstructionists.
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Their greatest fear is that they've been wrong all along, but there is nothing to fear in truth.
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Once someone decides they're a flat-earther, it's too late, they're not coming back from that nonsense. They didn't use facts, evidence, or logic to reach that conclusion in the first place, so you can't really use facts, evidence, or logic in your argument to convince them the earth is indeed spheroid.

•The word NASA is a derivative from these words.

•In its original Hebrew it is נָשָׂא (naw-shaw').

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•Transliteration: “Nasah” or “Nasa” (positive)

•Definition: - to lift, carry, take.

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•The negative context is - Transliteration: “Nasha” (negative).

•Defitions (plural / more than one): Strong's Concordance Hebrew Dictionary list the definition for the Hebrew word #5377 (beguiled as used in Genesis 3:13), is shown here as: #5377 nasha', naw-shaw'; a prim. Root; to lead astray, i.e. (mentally) to delude, or (morally) to seduce:-beguile, deceive., X greatly, x utterly.

You mean the cited Web page in <www.fixedearth.com>?
Too Much [expletives deleted] Eye-Strain--Didn't Finish (TMES-DF).

Only an artsy-trendy idiot would expect people to read long prose displayed in medium-gray on some artsy-trendy background-color that's any darker than white.  Oooh!  But they're edgy & hip young "Web designers",  and anything they do is kewwwl!

Hah!  As my eyes accuмulate seniority, I increasingly want to see all such artsy-trendy idiots dragged out from in front of their luxurious set of huge computer monitors used only under the most visually perfect lighting--and shot!