Venus changes its astrological sign (ie, moves 1/12th of its way through the sky) roughly monthly, and Mars changes about every two months; noticing these changes doesn't require a complex multi-generational oral tradition. Jupiter and Saturn are slower, but still complete a full cycle within a person's lifetime.

https://www.elsaelsa.com/astrology/how-long-do-planets-stay-...

Which is to say, these are noticeable differences for individuals, especially any who are using the fully-evolved intelligence of a human brain staring regularly at the sky instead of a smart-phone.