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I viewed Mercury's phase tonight with an 80mm F6 triplet at 68x. It was similar to an eight-day old Moon. (One day after first quarter.)
On the 25th July, Mercury, Regulus and the 2 day old Moon are all close to each other. From Northern Asia and northern Europe, the Moon occults Mercury at approximately 7pm our time.
I will (weather permitting) look at the Moon at that time and try and do 3D representations in my mind about the difference in parallax re the Moons position from my viewing and the size of our planet. (Just wonderment, nothing serious).
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