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The shape of the earth is a spiritual matter because it was revealed to us in scripture.  And yes, the saints have spoken, on antipodes, Jerusalem in the middle of the earth, the tabernacle (which is designed from the shape of the earth) and against heliocentrism, the modern NASA lie that embodies a moving globe.  When you come up to speed on Church teaching on the matter, all will be light for you.

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No, the shape of the earth is not a spiritual matter. You are wrong.
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There has never been a pope who has decreed the earth is flat. The popes since the middle ages have specifically avoided the topic because they don't want mud on their faces, and they know better, unlike you.
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The popes have been careful to stick to spiritual matters, that is, up to Vatican II. And since then they haven't pronounced authoritatively about anything at all. That's another story.
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The condemnation of Galileo is a case in point. It has nothing to do with the shape of the earth, only the question of whether the earth moves. They said it does not move. That doesn't mean it's "flat."
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All of our observations of the heavens tell us the earth is a globe, just like all the other large heavenly bodies.
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And all of our observations of the universe tell us that we are unable to determine whether the earth moves or not, but since the Church has said it does not move, it helps us to see that those who claim that it does move are pridefully mocking the Church, like Galileo dared to do. Notice he was not handed over to the secular authority for capital punishment, but was subjected to years of house arrest - free room and board, basically.
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Our discussion is regarding the physical dimensions and observable parameters of the earth, not whether it moves or not.
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This discussion has absolutely nothing to do with heliocentrism. Your confusion on this point is redundant and tiresome.
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Back to the matter at hand....
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Today the moon has been approaching its last quarter, and the angle between the moon and the sun is decreasing. Do you know what it is today? No, you do not, nor do you want to know because you are not interested in the truth.
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You and other flat-earthers like you are dug in to your erroneous thinking, your sacred cow false god of flat-earthism. When you realize your error it will be a light to you.
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It's a sad case when people get confused between the material and the spiritual. This has been the case in other areas too, and it does nothing for your faith.
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I can't blame you guys for being disillusioned with all the lies in the media and all the deceptions in world events, politics and popular culture. The French Revolution is still believed by atheists to have been a wonderful thing. Not a few of these have fallen into devil worship as a consequence of their error, which is a fulfillment of prophesy, by the way, see Romans chapter one. Animals and "creeping things" have become their replacement for God. I heard a woman preaching on the radio the other day saying that the Virgin Mary (in regards to the Fatima apparitions) is one and the same as Gaia (Greek Gaea, goddess or personification of earth), or "Mother Earth." She said that "She has revealed herself in many forms through the ages" and Our Lady of Fatima is just another one of those ways. Sad.
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So you want Scripture: How about Isaias xl?
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[21] Do you not know? hath it not been heard? hath it not been told you from the beginning? have you not understood the foundations of the earth? [22] It is he that sitteth upon the globe of the earth, and the inhabitants thereof are as locusts: he that stretcheth out the heavens as nothing, and spreadeth them out as a tent to dwell in. [23] He that bringeth the searchers of secrets to nothing, that hath made the judges of the earth as vanity. [24] And surely their stock was neither planted, nor sown, nor rooted in the earth: suddenly he hath blown upon them, and they are withered, and a whirlwind shall take them away as stubble. [25] And to whom have ye likened me, or made me equal, saith the Holy One?

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So you want Scripture: How about Isaias xl?
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[21] Do you not know? hath it not been heard? hath it not been told you from the beginning? have you not understood the foundations of the earth? [22] It is he that sitteth upon the globe of the earth, and the inhabitants thereof are as locusts: he that stretcheth out the heavens as nothing, and spreadeth them out as a tent to dwell in. [23] He that bringeth the searchers of secrets to nothing, that hath made the judges of the earth as vanity. [24] And surely their stock was neither planted, nor sown, nor rooted in the earth: suddenly he hath blown upon them, and they are withered, and a whirlwind shall take them away as stubble. [25] And to whom have ye likened me, or made me equal, saith the Holy One?

Here is a picture that represents the globe of the earth.