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Here is a good diagram that pictorially describes what I have been talking about with the "angle between the sun and the moon at the phase of quarter moon."


This is how it looks during the First Quarter moon, which will be coming up in about 2 weeks.
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We just had the Last Quarter moon last week, on Thursday. I measured the angle between the sun and the moon and found it to be greater than 89 degrees and less than 90 degrees.
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There are consequences to these measurements, since as you can see in the diagram, the three corners of the geometrical figure described by the earth, moon and sun is a right triangle.
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Right triangles are very easy to use in determining proportions between the lengths of the sides when one of the not-square interior angles is known. We already know that the angle at the moon is 90 degrees because it is a quarter moon, which see. 
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We have measured one of the other two angles, the angle from earth between the sun and moon, and have found it to be consistently close to 90 degrees at the quarter moon phase.
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Therefore, without having to travel to the moon or the sun to check the angles of the other two bodies, we can surmise what the angle between the earth and moon as viewed from the sun would be.
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Since any triangle has 3 interior angles and their sum is always 180 degrees, we subtract the 90 degrees at the moon and the 89-plus degrees at the earth and come up with an angle of less than one degree at the sun.
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ETC............

Great Circle Sydney to Santiago on "Google Earth"
   about 11,400 km

Shortest Sydney to Santiago on "Gleason Map"
   about 25,400 km

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There have been commercial flights between Sydney and Santiago -- they've had a duration and mileage comparable with the former (11,400 km) but not with the latter (25,400 km).
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Again, no flat-earthers to reply:  they'd have to say, NO THATS(sic)NOT TRUE, or something like that.
(Leaving out the apostrophe, of course.)
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Great Circle route flights between Perth, Australia and Buenos Aires, Argentina would take the plane almost directly over the South Pole:
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The alternative route on the bottom appears obviously curved here - between Buenos Aires and Sydney. That's a Great Circle route too, but our angle of view is not right above its coordinates. This view is directly above the South Pole, so the top route between Perth and Buenos Aires appears only very slightly curved.
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If you understand what Great Circle route is, you'll understand the difference and reasons. If you don't, you won't. And if you don't want to, you NEVER WILL.
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Simple.
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Scripture is clear for those who read it, earth is flat.  The Church teaches it. Science confirms it. Only the ill-informed, blind or confirmed globalist/pagan denies it.  There is not one single teaching that the earth is a moving ball.  Nor that it is a hanging ball in mid-air. Scripture says the earth has a foundation.  A firm foundation.  Pillars.  Bounds. A firmament that divides the corporal on earth from the spiritual in heaven above, and also within that hardened dome, the sun, moon and stars move.  Scripture teaches that stars have fallen to earth and that stars will fall to earth, an absurd notion to those who believe stars are hundreds of times larger than earth and made of earthly elements like rock. The saints teach there is a center on earth, which is Jerusalem. They teach there are no people walking upside down relative to the rest.  These are Catholic teachings, and cannot be denied without demonstrating a loss of Faith in truth.  Those who persist in the fallacy of a ball earth are deniers of God and His Word.