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I'd be interested  in seeing clear evidence of what you are talking about, and how exactly you feel this is impossible on a flat disc.

By the way,

Are you aware that flat earthers are open to question about maps?

Are you aware that our proofs are based on the earth on not on the sky? Lack of curvature: http://flatearthtrads.forumga.net/f9-flat-earth-proofs

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This post, above, didn't make sense to me before when I read it the first time. Going back now and reading it again, it seems the extra word: "...based on the earth on not on the sky?", made it confusing and not worth replying to.

Now it appears what you were trying to write was the following:

Are you aware that our proofs are based on the earth, on not on the sky?

In other words, you put "on" where you meant to insert a comma. I suppose.

So then you want to rule out half the evidence available to us (the sky) and that would be why? -- because, perhaps, the evidence in the sky is too irrefutable and easily verified? Perhaps. That would make your motive understandable, I suppose.

And then you claim to have "proofs" but fail to deliver any. Maybe you should take a class in Geometry and another one in Scholastic Logic, before you throw around claims of proving anything!

In any event, the site you refer to, flatearthtrads.forumga.net, is pretty pathetic, and about 8 months old. They have something like 10 members or less, and one post every what, week or two? Most members have never posted and most threads have very few views and no replies. So it's pretty dead over there. But I guess it's the kind of place you like to visit and even cherry-pick from, no?

Oh, I should also say they claim to be followers of Bishop Williamson but can't seem to manage any posts where +W has voiced support for their odd theory of flat-earthism. I have never heard +W say anything about "flat earth" except in jest. Maybe he doesn't want to make someone feel bad or whatever. Maybe he thinks it's not a battle worth trying to fight because it doesn't have any immediate consequence. I don't know what his intentions are unless he explains himself. But it's a crying shame that a website like that is dragging his good name into a controversy where he has not made his voice heard, so they're implying to speak in his name and in his absence. There's a term for that, you know, and it's not very flattering, to say the least.

(It's called detraction.)

They post videos of perhaps well-meaning you-tubers but these video makers have very little knowledge about how to sight level lines or how to determine if your viewfinder is level from left to right, nor do they appear to have any ability to sight or measure angles. In other words, they're not credible in their topic. More pathetic-ness, piled higher and deeper. But they're eager to jump to conclusions anyway.

What are you talking about? I'm game...

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Binoculars use two lines of sight to allow us to discern which objects in view are closer to us or further away. They do this because there is one direction viewing in the left lens a given object at a fixed distance, and a different direction viewing the same object at the same distance in the right lens. Effectively, your left eye's angle of view differs from your right eye's angle of view, by some amount, and this amount of difference varies according to how far away the object is.

Tomorrow, Monday April 3rd, the moon will enter its first quarter. If you are in the USA or Canada, you can go to the following website
http://www.almanac.com/astronomy/moon/calendar/CA/Santa%20Monica/2017-04
and you can enter the name of your city, and state or province, press ENTER, and the site will display the month of April in a calendar which shows the time of day in your city when the moon will be at exactly one quarter illuminated by the sun. Today, Sunday April 2nd, at 2:00 pm in the Pacific Daylight Savings Time Zone, the moon appears at 37% illuminated according to the Old Farmer's Almanac. In the past hour the same site has increased from 37% to 39%, so this figure is a changing feature for the day in progress, apparently.

They don't go into detail on this rapid change, but that 37% to 39% becomes 50% by mid-day tomorrow, so perhaps it was 35% early this morning and then in the afternoon today it's going to update to 40% or even more, so the moon's illuminated portion can increase to 50% by 20 hours from now. When the moon appears to earth as 50% full that is when we say it is a "quarter moon" because only half the moon is visible and half of that half (1/2 x 1/2 = 1/4) is a quarter. Effectively, the moon is a sphere with half of it being illuminated by the sun but we can only SEE half of the moon at one time, the other half being the far side of the moon, and only half of the part we can see is facing the sun. We are seeing one-fourth of the moon illuminated, and one-fourth equals one quarter.

We are seeing one-fourth of the moon illuminated when the moon appears as a "quarter moon."

Of course, if you are wont to deny that the sun's light shining on the moon makes it appear to us on earth as a quarter moon, or you would say something like, "the moon's light comes from inside the moon," then you can ignore this exercise because whatever else you have to say won't matter in this discussion. Some flat-earthers claim they can see starlight shining through the moon and therefore "it must be very thin, like about 3 inches thick," and that since it's so thin it can't be a sphere or a globe, implying that since the moon is flat, the earth must be flat as well. Similarly, there are flat-earthers who have made known their odd belief that there is a dark region all around us where we can't see parts of the sky because "everything in the dark section is behind the horizon." If this is the sort of comments you are prone to make then you should just skip this thread and go post on flatearthtrads.forumga.net because they're desperate for contributions since they only get one or two views each day. By the way, if you are wont to believe that it is something that emerges from our eye that goes to the object in view (moon) that enables us to see things, or that reality is in the mind or that truth or reality is in your eye and not in the thing you are looking at (the moon), then you can likewise give up on this discussion and head on over to some other forum of your liking.

Therefore, provided that you are willing to at least entertain for the moment that it's the SUN shining on the MOON and us looking at the MOON from EARTH that's the reason that we see a quarter moon -- that is, the moon as a globe, or spherical object, with light shining on its right side, while being almost entirely dark on its left side (in the northern hemisphere, obviously, USA or Canada), with the line separating the light side and dark side going somewhat vertically from the top of the moon to the bottom -- then we can move on to the next aspect of this observation, which is:  measurement of the angle between two different lines -- our line of sight toward the sun and our line of sight toward the moon. 

The link I provided above gives the time of day from the Los Angeles area as 11:40 am, when the first quarter moon will occur. That is the preferred time to make the observation I will describe below. It is of no great consequence if the observation is made in my area later in the day, for example one or two o'clock in the afternoon, or even until sunset, which occurs here at 7:16 pm. The time of the observation should be noted, however, so it can be used in the analysis that follows.

At 11:40 am tomorrow, I won't be able to see the moon yet because it will be lower than the horizon. We are in Daylight Savings Time, which has advanced our clocks one hour so by Standard Time (which is the time used for astrological position of the moon and sun) it will be 10:40 when the quarter moon occurs, and the moon won't be rising until after 12:00 pm, an hour and 20 minutes later. Therefore the first moment I can make my observation will be after 1:00 pm PDT (UTC -7). In other words, I'll be almost 2 hours late at best. But it won't really matter that much for our purposes.