To be clear for anyone who isn’t familiar, the ~28 days vs ~30 days thing comes from the number of days it takes to complete an orbit vs the number of days it takes for the sun to be in the same relative position, respectively. Historically, calendars have followed the latter because that’s what dictates what phase the moon is in. The discrepancy happens because the earth is orbiting the sun at the same time the moon is orbiting the earth.
To be clear for anyone who isn’t familiar, the ~28 days vs ~30 days thing comes from the number of days it takes to complete an orbit vs the number of days it takes for the sun to be in the same relative position, respectively. Historically, calendars have followed the latter because that’s what dictates what phase the moon is in. The discrepancy happens because the earth is orbiting the sun at the same time the moon is orbiting the earth.