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Like I said, and so it is, the flat-earthers will have nothing to do with objective observation.
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Flat-earthers will never come up with a working model that explains what we see in the sky.
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They cannot provide a working model that demonstrates the phases of the moon, so they demand that someone else produces one.

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The courses the sun and moon make across the sky do not jive with their defective hypothesis.
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The phases of the moon, observed from various places on the earth, describe a spherical earth, not a "flat earth."
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The Last Quarter moon occurred this morning at 5:27 am in the Pacific time zone (PDT).
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Therefore both the sun and moon were visible in the sky at that time in the Eastern USA and in the Central time zone, but not in the Mountain or Pacific time zones.
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IN FACT, both the sun and moon are now visible in the sky as I write this.
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This morning at 8:37 am Eastern Daylight Time and at 7:37 Central Daylight Time everyone there could see the Last Quarter moon high in the sky with the sun having risen in the east at 7:05 am.
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All you needed to do is measure the angle between the sun and the moon at that time.
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You didn't need a fancy apparatus to get a very close approximation.
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If you had tried to do this in Mountain or Pacific time, it would have been later when you could see the sun after sunrise, and the moon's angle to the sun would be a little bit less since the time of the quarter phase would have just passed before the sun rose.
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It makes no difference whether you are in northern Canada or South America, if you're in those time zones you'd see the same moon phase.
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In fact, from all over the earth, everyone sees the same moon phase at the same time.
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If the earth were "flat" you would not be seeing the same moon phase from those diverse places.
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Flat-earthers' inability to understand this is due to their inability to understand the very thing they profess, the "flat earth."
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They cannot produce a "flat" earth model that demonstrates the moon phases, so they demand that someone else should produce one.
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Two weeks ago was an ideal opportunity for everyone in the USA to observe both sun and moon when the moon reached the First Quarter phase.
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This quarter moon event (whether First Quarter or Last Quarter) is a very important time for learning about the relative distances from earth to moon and from earth to sun.
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Flat-earthers have time and again shown that they have no interest whatsoever in learning this truth.
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They refuse to pay attention, and they have no idea what they're missing (unless they're deliberately trying to deceive others).
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