Where have any of those who support the flat earth said that it is a dogma?

An Even Seven falsely accuses forum members all the time of being heretics if they do not accept his view of the state of the Church. You don't seem to have a problem with that.

It is rarely said explicitily to be a dogma but this is often implied.

It bothers me most of the time when posters refer to other posters as heretics.  If I said something every time it happened, I would not have time to post about anything else.  My silence does not indicate that I do not have a problem with it.

Where is an official copy of the decree that states that Catholics can hold the heliocentric view?

In doing a google search, all I came up with is a mention of a decree by Pope Pius Vll in which he said that books which describe heliocentrism could be published.

Vol. I, fol. 174v (Bruni, scribe)

The Assessor of the Holy Office has referred the request of Giuseppe Settele, Professor of Optics and Astronomy at La Sapienza University, regarding permission to publish his work Elements of Astronomy in which he espouses the common opinion of the astronomers of our time regarding the earth’s daily and yearly motions, to His Holiness through Divine Providence, Pope Pius VII. Previously, His Holiness had referred this request to the Supreme Sacred Congregation and concurrently to the consideration of the Most Eminent and Most Reverend General Cardinal Inquisitor. His Holiness has decreed that no obstacles exist for those who sustain Copernicus’ affirmation regarding the earth’s movement in the manner in which it is affirmed today, even by Catholic authors. He has, moreover, suggested the insertion of several notations into this work, aimed at demonstrating that the above mentioned affirmation [of Copernicus], as it is has come to be understood, does not present any difficulties; difficulties that existed in times past, prior to the subsequent astronomical observations that have now occurred. [Pope Pius VII] has also recommended that the implementation [of these decisions] be given to the Cardinal Secretary of the Supreme Sacred Congregation and Master of the Sacred Apostolic Palace. He is now appointed the task of bringing to an end any concerns and criticisms regarding the printing of this book, and, at the same time, ensuring that in the future, regarding the publication of such works, permission is sought from the Cardinal Vicar whose signature will not be given without the authorization of the Superior of his Order.

Original Latin source: W. Brandmüller and E.J. Greipl, eds., Copernicus, Galileo, and the Church: The End of the Controversy (1820), Acts of the Holy Office (Florence: Leo Olschki, 1992), pp. 300-301.

There is no such thing as ‘dogmatic flatearthers’ that is the lamest term I’ve heard in awhile.
The earth is either flat or it’s not, therefore an objective truth is to be found somewhere. If it’s not flat and stationary, then according to ‘science people’ we are on a spinning ball flying through endless space. (Sungenis’ theory is too full of holes to be considered here) So which is it? Hmm, kinda does matter, it’s the ground you walk on everyday right? It’s the ground Jesus Walked on as well.
Those who say it doesn’t matter ‘it could be flat or round who cares’, do not have a real love of truth, and they certainly don’t belong in a discussion about the facts surrounding this topic, only to continually pipe in to say ‘it doesn’t matter’. Maybe it’s time to stop with the opinions on which pope said what and whether or not it was infallible and start looking into the objective truths, readily available, on the very foundation of your physical world.

There is a mountain of facts and evidence presented not only here but so many other places, that this is a
‘Globe Deception’ and it is meant for our undoing. Who would be behind a deception so monstrous and meant for our destruction? I think that was covered here already.
I want no part of this deception and refuse to pass it on to my children and the next generations to come.

Immaculate Heart of Mary intercede for Us!

I asked for an official copy of the decree to which you were referring. That's not what you provided.

The 1820 decree under Pope Pius VII removing all remaining prohibitions against the Copernican system. This arose from the request of Fr. Giuseppe Settele for an imprimatur on his book Elementi di ottica e di astronomia (Elements of Optics and Astronomy), which referenced Earth’s motion. The request was denied; Settele appealed to the Pope.


This translation is from the Interdisciplinary Encyclopedia of Religion and Science (Inters.org), which is edited by the Advanced School for Interdisciplinary Research, operating at the Pontifical University of the Holy Cross, Rome, and directed by Giuseppe Tanzella-Nitti. The translation is from the original Latin provided in W. Brandmüller and E.J. Greipl, eds., Copernico, Galilei e la chiesa : fine della controversia (1820) : gli atti del Sant’Uffizio {i.e. Copernicus, Galileo, and the Church: The End of the Controversy (1820), Acts of the Holy Office} (Florence: Leo Olschki, 1992), pp. 300-301.

I don't accuse forum members of being heretics all the time. Just those who obstinately hold the heretical opinion that heretics are Catholic. Not being a Sedevacantist does not make one a heretic.

http://inters.org/approval-Settele-heliocentric

As shown in the threads here, the Index maintains its moral force, according to Card Ottaviani and even Benedict XVI.