Quit blaming NASA....
The majority of earth orbiting cameras from which we see photos of globe earth actually don't have anything to do with NASA. They come from privately owned satellites and satellites owned by governments all over the world., e.g.
GeoEye: American owned by Digital Globe
SPOT: French, owned by CNES (Centre National d'Etudes Spatiales) – the French space agency
RapidEye: German, developed by Kayser-Threde GmbH and financed mostly by Vereinigte Hagelversicherung, a German agricultural insurance provider.
Meteostat: Run by EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), an intergovernmental agency involving 30 European Union countries, and based in Darmstadt, Germany based in
just to mention a few.
Many of those satellites weren't even launched by NASA. Unfortunately, members of the
"blame NASA" species of nutjob are too stupid to understand this.
... man has know that the Earth isn't flat for centuries.
Yes, many centuries.... over 20 of them!!
Pythagoras of Samos first mooted that the earth was spherical around 540 BC
Aristotle of Stagira proved it around 330BC
Eratosthenes of Cyrene measured its circumference in 255BC.
Aristarchus of Samos was the first person to show that the Sun was the centre of the solar system, not the earth. That was around 230BC, something that, despite the teachings of the Church and of Ptolemy, the Persian poet Omar Kayyam (who was greatly interested in mathematics, and astronomy) understood clearly. He even mentioned it in is famous
"Rubaiyat" v48
"For in and out, above, about, below,
‘Tis nothing but a Magic Shadow-show,
Play’d in a Box whose Candle is the Sun,
Round which we Phantom Figures come and go."