I posted this comment about this image on your Facebook post just now. Except for not using the terms preceding and following Limb, which I wasn't sure how to correctly apply to the image into my thought experiment, are my comments correct? I believe they are but can you correct me if they are not? Thanks in advance.
Another proof that the Earth is round (in fact, an example of one of the first ever empirical proofs of that fact seen and understood by the ancients): Earth's curved shadow touches and crosses the Moon. And at the eclipse continues and the shadow later leaves the Moon, if the shadow is well-centered, an observer would see that the shadow is completely circular and be able to deduce that the source of the Shadow, the Earth, is round and a sphere.
If the ancient Observer lived north of Earth's equator and was familiar with the hourly, daily and monthly look of the Moon from that vantage point, but somehow traveled to Australia to view the Moon and take this image, then he might also make note of several more clues that the Earth is round: the moon still rises in the East and sets in the West, but it is now high in the North rather than the South relative to his position when it is at its highest position above the the horizon each night . This is especially noticeable when the Moon is full and in the sky all night. It is also inverted, compared to his familiar Northern view. Finally, Mare Crisium ( the small, dark oval lunar "sea" at the Moon's lower limb in this image) is also on the moon's lowest limb upon rising, rather than at the Upper Limb in the northern hemisphere View.