A year is considered as the period during which the planet Earth makes a complete orbit around the sun.
In astronomical terms, 1 year have not 365 days as we expected, but its defined as 365,24 days. More specifically, 1 year takes 365.242199 days.
Transformed into sub-units of measurement of time, 1 year is exactly 8765 hours, or 526,000 minutes, or 31,600,000 seconds.
We must not forget the presence of the periodic leap years (containing one additional day => 1 leap year = 366 days).
“February 29 is a date that usually occurs every four years, and is called leap day. This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit around the sun in precisely 365 days.”
Another surprising fact is that the leap years do not always occurs every four years, as commonly believed. For example, years 1800 and 1900 were not leap years as were not divisible with 400, instead the years 1600 and 2000 were leap years by contrast to those mentioned above.
Based on this algorithm, its easy to demonstrated that the orbital period of the Earth moving in its orbit around the Sun is indeed 365.25 days.
In addition, it was found that it takes 365.24 days for the Earth to travel 938,888,400 km during one orbit around the sun.
Source: © CosmosUp.com.