Prove that statement. Show that both can see Crux at the exact same time. Not guess at it. Show it. Find a source, a testimony, anything. Two pages now, still no source. You are the ones making the claim. You say the earth can't be flat as you can see both at once. PROVE that, that is the case. No more crappy maps, no more dodgy reasoning. A source showing both places see Crux at the exact same time. Or leave this thread to die in the hall of RE wreckage, we affectionately call 'Flat Earth Debate'.
From Wikipedia: "For locations south of 34°S, Crux is circumpolar and thus always visible in the night sky."
I don't know how you consider this dodgy reasoning, but if something is
always visible at night below a certain latitude, and two places below that latitude share a period of night, that would make it visible from both places at the same time.
Another from Wiki:
http://en.wikipedia.org/wiki/Circumpolar_starWorthwhile quotes: "A circumpolar star is a star that, as viewed from a given latitude on Earth, never sets (that is, never disappears below the horizon), due to its proximity to one of the celestial poles. Circumpolar stars are therefore visible from said location towards nearest pole for the entire night on every night of the year (and would be continuously visible throughout the day too, were they not overwhelmed by the Sun's glare)."
"Some Stars within the far southern constellations, such as
Crux, Musca, and Hydrus, roughly south of the Tropic of Capricorn (-23½°), will also be circumpolar stars."
http://www.constellation-guide.com/constellation-list/crux-constellation/Another source which claims Crux is visible below 34 degrees south all year. It specifically says that as a circumpolar constellation, it never goes below the horizon.
I have found many other sources that claim it is visible all night, year round, from any point south of 34 degrees south latitude. A couple have been posted hear already. While none specifically say "from both Argentina and Australia", saying from
anywhere below those latitudes covers it.
I also have astronomy software that will show what you will be able to see from any point on Earth and any time, day or night. It clearly shows that Crux would be visible from both places at the same time. I don't have a way to post this however, and I don't suppose you'd take my word for it. I suppose this software could be part of the conspiracy.
I suppose none of this proves anything in the way your capitalization and emphatic way of posting asked. However, you said a source, a testimony, or anything. Those are sources. Is your claim that there is no period of night which both Argentina and Australia share? Will it actually take a simultaneous call to people in both locations where each claim to be able to see the southern cross stars?
This is just a discussion on a debate forum. No need to get worked up.