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CrazyRussian 3 points ago +3 / -0

Earth is more pear shaped with the equator being fatter than the poles yet NASA continues to show us perfectly photoshopped blue marbled Earth pics.

Difference is only few hundred meters, it is just unnoticeable on globe images. But it is still important for calculation of altitude.

You could receive high-quality realtime whole globe images from GOES satellites without any third-party between you and satellite using cheap RTL-SDR receiver and few more bits. To check if they are showing real picture you could compare cloud pattern with closer images received from satellites on lower orbit (NOAA,Meteor, easily received on same RTL-SDR dongle) and finaly looking at the sky above you.