Yes, there are seasonal variations in business (eg. agriculture!) but those aren't the "business cycle" which refers to the boom/bust recurrence (like the 1990s

Yes, there are seasonal variations in business (eg. agriculture!) but those aren't the "business cycle" which refers to the boom/bust recurrence (like the 1990s boom and 2000 tech bubble pop, the 2000-2008 boom and financial crisis, etc.)