My only concern would be that there could be gaps. If the kid was in K the last time the learning cycle was on stars, and then it doesn't return to it before HS, that kid would have much less knowledge of stars than the kid who did that in 6th grade.
But then I was at school for 10 years and was never taught any geography or about any stars. If the kids can be taught to learn and encouraged to be curious they will fill in any gaps they are concerned about. I am envious we simply have no variation in schools here.
