Retrograding Mercury is conjunct the Sun at 14° Libra today, forming what is known as an inferior conjunction. This Wikipedia article has a very nice explanation and diagram of what an inferior conjunction is, and I quote:

An inferior conjunction occurs when the two planets lie in a line on the same side of the Sun.

And Robert Wilkinson of Aquarius Papers offers an insightful explanation of what the two types of conjunctions are.

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