Predict when an eclipse would happen, but not necessarily what type and where it would be visible.

The Saros is a cycle of 18 years & 11 days; that is, the Metonic Cycle less twelve lunar months. It is composed of the Venus cycle, the anomalistic cycle [ the Moon's rotation around the Earth], the Draconic Cycle & the Soli-lunar cycle, The last two deal with eclipses. It is also handy for predicting tides.

Easter is the Sunday after the Paschal Full Moon. The dates of the Paschal Full Moon are approximated using the Metonic cycle, a list of full moon dates that repeats every 19 years. 2012 is the 18th year of the current cycle. Until 2199, that means that in 2012 the Paschal Full Moon date is April 7.

The next full moon will be on January (Jan.) 19 2009

Next will be on February (Feb.) 20 2009

Next will be on March (Mar.) 21 2009

Next will be on April (Apr.) 22 2009

And so on...

nitrogen cycle, carbon cycle, water cycle, and sulfur cycle

A payroll cycle is the determined period of time of allocated hours worked.