Physical seasons, and the modern western calendar, are both based on the sun. Having two moons wouldn't make a difference there.
Two moons would make the ocean tides more complicated, though.
this post was submitted on 01 Nov 2023
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Perhaps we’d have entirely solar-based calendars with four month-like divisions for the seasons, based on the angle of shadows cast by the Sun (I hear the Mayans had these huge dial things that just counted from 1 to 365) and leap days added onto one season every few years.
You could simply ignore one moon for you calendar. 😄
We'd have two Mondays. Nothing good can come of this.
NOOOOOO
Given our propensity to watch the stars and moon, I think we'd figure out some month schedule if we wanted one.
Months really don't matter all that much because the seasons are still based the Sun and the planets tilt. The days get shorter and longer each day and that's pretty easy to observe.
(We might actually get a month that makes more sense if we throw out lunar cycles. One that aligns with the week.)
True, it takes 28 days for the moon to orbit us and yet only one of our months is actually 28 days long (and even then it's 29 if the year's a multiple of 4). Every other month is either 30 or 31 days long.
I think that technically we have two 'moons' already. Just that the other one is super small and doesn't really have much effect on the planet.
Sorry that this didn't answer your question, and feel free to correct me if I'm wrong.
I've heard people describe the asteroid Cruithne as earth's second moon (the chat show QI did a bit on it, and it's in a Steven Baxter novel). But I think that's kind of a misleading description - it orbits the sun not the earth, just in a way that regularly syncs up with the earth's orbit.
Many indigenous peoples tell the time of year by the stars rather than the moon. A certain constellation just became visible? Must be X time of year!
Our fantasy world artist would make worlds with three moons instead of two. Who knows they might even think having one moon would be cool.
Earth's moon is notably big. Relative to the size of its parent planet, it's easily the biggest* in the solar system (or second biggest if you Stan Pluto as a planet). If there was a second moon, it would likely be a lot smaller. So, I don't think it would have much practical effect on things like tides or timekeeping. It would still have cultural significance in things like mythology and astrology. If we could observe moon-moon interactions we might have discovered gravity earlier.
/* in absolute size, there are a couple of larger moons, but they're moons of giant planets so Luna still wins in relative size.