You may not have learned it elsewhere:
     We have 7 days in the week because the ancients were aware of seven 
"heavenly bodies":  Sun, Moon, and the five (of the 9) planets which they
could see.
     The Romans were the first to name the days after mythological 
Gods which had planetary connections, such as Jupiter (chief God), Mars 
(God of War), and Venus (Goddess of Love).
     Along the way, and much later, the Germans (aka Angles/Saxons/
Nordics/etc) replaced some of them with a few heavyweights from their own 
pantheon and so the days (in English) became a mix of planetary objects 
and Norse Gods.
     In other Romance languages (derived from Latin, not Germanic) the 
original (Roman) planetary names are often retained. Thus we have:

    Sunday      From    Sun's Day.

    Monday      From    Moon's Day. (Fr:"Lundi" Ital:"Lundei" Sp:"Lunes";
                            (all derived from luna/lunar)

    Tuesday     From    Tewe's Day, a Norse/Germanic female deity.
                Was:      Mar's Day   (Fr: "Mardi" ; Sp: "Martes")
                          (You knew that "Mardi Gras" is Fat Tuesday!)

    Wednesday   From    Woden's Day, (aka: Odin's Day), the chief god in
                            Teutonic mythology.
                Was:       Mercury's Day. (Fr:"Mercredi" Ital:"Mercoledi")

    Thursday    From    Thor's Day. (He's the one that sends bolts into
                            your surge protector and computer.)
                Was:      Jupiter's Day: "Jove" (Fr: "Jeudi" Sp: "Jeuves")

    Friday      From    Frigg's Day, a rotund Germanic female deity.
                Was:       Venus' Day. (Fr: "Vendredi"  Ital: "Venerdi")

    Saturday    From    Saturn's Day.

You will never forget this, now.

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