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Which Earth cycle are you referring to (there are many). If you want us to answer your questions you must be sure your question is as precise as possible.
it doesnt stop
Period
The calendar of 1998 will repeat in the year 2029. This is because there is a 11-year cycle for calendars to repeat. In this cycle, the days of the week for a particular date will match up again after 11 years. Therefore, the calendar of 1998 will align with the calendar of 2029.
The full cycle, from maximum to maximum, is 11 years, so the half cycle would be about 5 1/2 years. This is a long-term average; individual cycles can be longer or shorter.