The seven-day week, a system universally adopted today, originated from ancient astrological practices that associated each day with one of the seven visible celestial bodies known at the time.
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Hey, my name is Chris Brennan and in
this video I'm going to talk about why
there are seven days in the week rather
than some other number like 10 or or
four or eight or what have you. So, this
question was posted recently in one of
the like historian subreddits on Reddit
and I ended up chiming in because uh
some of the answers were a little bit uh
not great. So this was my answer which
is that the reason why there's seven
days in a week is because the weekday
was partially patterned after the seven
traditional planets which are the seven
vis visible celestial bodies that were
known about in ancient times which are
the sun, the moon, Mars, Mercury,
Jupiter, Venus and Saturn. And that's
actually the specific order of the days
of the week based on their planetary associations
associations
which is that you have Sunday which is
associated with the sun. You have Monday
which is associated with the moon, moon
day essentially. You have Mars which is
Tuesday. You have Mercury which is
Wednesday. You have Jupiter which is Thursday,
Thursday,
Venus which is Friday. And finally
Saturday which is associated with the
planet Saturn. So this is why there are
seven days in a week rather than some
other number like there could be 10 days
in the week, there could be 5 days in a
week or what have you. We have seven
days in a week because traditionally
there were seven planets uh including
the sun and moon. So the origins of this
system historically are kind of murky.
Uh because it emerges in the
Mediterranean world sometime after the
1st century BCE
uh when hellenistic astrology had
exploded in popularity in the Greco
Roman world around that time. And this
system of assigning the planets to the
days of the week is already mentioned by
the 2 century astrologer Vadius Valins.
So we know for sure that it probably
precedes him by at least a century or
two which is going to put it somewhere
in at least the first century CE if not
further back to the 1st century BC. And
that kind of makes sense within the
context of what we know about the
history of astrology because also uh
during the hellistic period around the
2n century B.CE CE in the 1st century BC
there were a lot of there was a lot of
systemizing going on and there were a
lot of different systems and schemes
just like this one that were being
created uh partially for the purposes of astrology.
