"Dies Mercurii"
Throughout human history, time and space have been inexorably linked:
The seven-day week originates from the calendar of the Babylonians, which in turn is based on a Sumerian calendar dated to 21st-century B.C. Seven days corresponds to the time it takes for a moon to transition between each phase: full, waning half, new and waxing half....The book of Genesis (and hence the seven-day account of creation) was likely written around 500 B.C. during the Jewish exile to Babylon...
[Today]
Wednesday is "Wōden's day." Wōden, or Odin, was the ruler of the Norse gods' realm and associated with wisdom, magic, victory and death. The Romans connected Wōden to Mercury because they were both guides of souls after death. “Wednesday” comes from Old English “Wōdnesdæg.”"
https://www.livescience.com/45432-days-of-the-week.html