You bring up some interesting points, Andrew. The French Dimanche, I believe, comes from Latin, Dominicus (Lord, the word becomes to dominate in English). If you look at Spanish, Domingo, you can trace how the word became softened and shortened over time.

Interestingly, Sanskrit and Sumerian cultures also use similar day/astrological connections with the days of their weeks, although in Hebrew the names of the week are simply first day, second day, so on (sabbath, heb. shabbat, literally means the seventh).

Some other points: Although Judaism/Christianity seriously condemn witchcraft/spiritism, they are steeped with Astrological connections.
The record of the passover and exodus from egypt has many "ram/lamb" themes, including a passage where Joseph tells his family to deny being shephards and say that they breed cattle instead (which ends abruptly), and the famous incident where Israelites were executed at the foot of Sinai for calf worship. All this at a time when the dominant constellation in the sky was changing from Taurus, the bull, to Aires, the ram.
The Israelites used the Urim and Thumim for divination purposes, some prophets interpreted dreams, and Daniel was said to possess the "wisdom of the Chaldeans", who specialized in Astrology.
In a passage in the book of Job, G-d challenges Job's creative abilities, and asks him if he can bring forth the Mazzaroth (literally, Zodiac constellations).
The life of Jesus was at approximately the same time of the shifting of the dominant constellation from Aires, the ram, to Pisces, the fish.