What is the Certified Pool/Spa OperatorÂ® Certification Program? A CPOÂ® Certification provides individuals with the basic knowledge, techniques, and skills of pool and spa operations. This training has helped protect millions of swimmers by reducing hazards at aquatic facilities.
A year is the orbital period of the Earth moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility.
A solar year is the time that it takes the earth to complete one  cycle around the sun. The year is the time taken by earth to  complete a cycle around the sun which takes aâ¦bout 365.25 days.   So, a calendar year is 365 days and 1 quarter. Every Leap Year  (once in 4 years) there is an extra day in February.    A year technically is the time taken for a planet to make one orbit  of the sun. At that rate, an Earth year is shorter than a Mars  year, which is 687 days at a 24 hour day.