Day of the Thunder

[Veneda]

Makes sense because Slavs didn't have a 7-day week. Saturday came with Christianity.

There are hints that pre-Christian Slavs had 5-days week, as the 5 finger hand, but don't ask me about sources, I just heard it as an hypothesis from scholars who write articles about Slavic issues.

[Rugevit]

All Slavic languages have similar naming for the day of the week.

Sunday – Nedelia – (Ne-delia – Literally 'not doing anything' or rest day)
Poniadzelak – Monday – the day after 'niadzelia' (sunday)
Utorak – Tuesday – second day of the week
Serada – Wednesday – middle of the week
Thursday – Chacver – fourth day of the week
Friday – P'yatnica – fifth day of the week.
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Sobota – Sutarday is a loanword in every Slavic language.

[Rugevit]

There are hints that pre-Christian Slavs had 5-days week, as the 5 finger hand, but don't ask me about sources, I just heard it as an hypothesis from scholars who write articles about Slavic issues.

Maybe niadzelia - the day of rest - came with Christianity too. But then poniadzelak (monday) is derived from 'niadzelia' (sunday)

[Veneda]

Maybe niadzelia - the day of rest - came with Christianity too. But then poniadzelak (monday) is derived from 'niadzelia' (sunday)

I don't think so. Niedziela - rest day/ Sunday was dedicated in pre-Christian times to Slavic Sun God - Svarożic. Till now there is a tradition of Poles to eat broth on Sunday (rooster was an animal which was dedicted as an offer to Sun God/Svarożyc)

[Mens-Sarda]

Our week days are the result of a vicious reply of the church against paganism. So they are like this:

Sábado - Saturday
Domingo - Sunday
Segunda-Feira - Second Fair
Terça-Feira - Third Fair
Quarta-Feira - Fourth Fair
Quinta-Feira - Fifth Fair
Sexta-Feira - Sixt Fair

The responsible is actually an hungarian missionary from the 6th century who made his way here. He thought unworthy to use latin pagan names for the week days.

in Sardinian (Logudoresu) they are quite Latin-like

Saturday = Sàppadu
Sunday = Dominiga, Dominica
Monday = Lùnis
Tuesday = Màrtis
Wednesday = Mèrcuris
Thursday = Jòia, Jòvia
Friday = Chenàpura, Chenàbura

the name for Friday is very particular, I think it's present only in Sardinian, it comes from Latin "Coena Pura" that was the name given by Hebrews and first Christians to the Friday dinner before the Shabbat holiday

they are quite similar also in Corsican language

Sàbbatu
Dumènica, Duminica
Luni
Marti
Mercuri, Marcuri
Ghjovi
Vènneri, Vènnari

[Hubal]

You should make a map for Saturday

[Peikko]

Torstai in Finnish.