Mnemonics for centures or any other longer periods, like Zodiac signs other than Chinese?

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Chinese Calendar Cycles

The Chinese traditional lunar calendar has a cycle of sixty years. Within this there are a twelve year sub-cycle, during which the year of the sheep, for example, recurs after twelve years.

As Semaphore commented below, "The 12 animal signs were associated with the 12 earthly-branches, which combines with 10 celestial-stems to form the sexagenary stems-and-branches cycle". This also meant there were 60 uniquely named years.

Mayan Calendar Cycles

The Maya Calendar has 19 Haab' months and a cycle of 52 Haab' years or 18,980 days.

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The Long count calendar has a cycle of 63,081,429 years.

Table of Long Count units
unit            period                    Days  Approximate
                                                Solar Years
1 K'in                                       1   
1 Winal         20 K'in                     20   
1 Tun           18 Winal                   360           1
1 K'atun        20 Tun                   7,200          20
1 B'ak'tun      20 K'atun              144,000         394
1 Piktun        20 B'ak'tun          2,880,000       7,885
1 Kalabtun      20 Piktun           57,600,000     157,704
1 K'inchiltun   20 Kalabtun      1,152,000,000   3,154,071
1 Alautun       20 K'inchiltun  23,040,000,000  63,081,429

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