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And consider these are 800k galaxies mapped in the subtending angle of three moons in the sky...

If Claude is correct, these 0.54 square degrees represent 0.0013% of the full 41,253 square degrees of the sky (4*pi steradians).

I checked the math and it is correct! So assuming this is a representative sample, there would be 800000/0.000013 ~= 61 billion galaxies in the celestial sphere.

According to Wikipedia, "It is estimated that there are between 200 billion to 2 trillion galaxies in the observable universe."

Edited: Off by some orders of magnitude.

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