Periods

There is a change of periods of the day: day, evening, night, and morning. There is a change of seasons: summer, autumn, winter, spring. But there are also changes of periods on a much larger scale. This is logical. Periods of the day exist because the planet turns around its axis. Seasons exist because the planet turns around the sun. It is logical that there is also the turning of the planet around the center of the galaxy, which in turn also causes changes. But we should not limit ourselves by direction or size. Cyclic changes exist that are smaller than a day and bigger than the changes caused by the turning of the galaxy.