Working as a zookeeper requires you to be passionate about animals and wildlife conservation. You often spend more time with the animals than other zoo employees, getting to know their habits and personalities. This helps you determine when the animals are healthy or whether they need veterinary care, a vital role of primary caregivers.
So on average the number of days between two similar phases (e.g. between one full moon and the next full moon) is about 29.531 days. This period is referred to as a lunation, lunar month, or synodic month.
A blue moon is a name given to an irregularly timed full moon it also known as a Naiomy. Most years have twelve full moons which occur approximately monthly, but each calendar year contains those twelve full lunar cycles and an excess of roughly eleven days. The extra days accumulate, so that every two or three years there is an extra full moon (this happens every 2.72 years).