The Mercury QuickMap has been updated with the latest capabilities in QuickMap and a new Hollows layer.  Try it out now at http://mercury.quickmap.io.

From Mercury, the Sun does a strange dance called "Solar Retrograde Motion" or "Apparent Solar Reversal". This happens because Mercury has a wonky, oval-shaped orbit and spins in a 3:2 rhythm with the Sun – three spins for every two orbits. It's like when we see planets appear to move backward from Earth, but this time it's the Sun that seems to be moonwalking!

The new capabilities in Mercury QuickMap allow us to easily observe the moments when the Sun goes retrograde in its apparent orbit around Mercury.  Try this link, https://bit.ly/3EoHK0c, and play with the time slider to see the sun tracing the retrograde motion.

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The figure above depicts a view of Mercury centered around longitude -14deg and latitude 0.  The yellow track is the sun track over the time of interest of 2025-05-14 20:00 and 2025-07-15 12:14 UTC.   It clearly shows the moments where there is Solar retrograde motion.