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An Earth year (or year on Earth), signifies the time it takes for the planet Earth to revolve around its sun. For someone on Earth this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic.
In astronomy a year is defined as 365.25 days of 86400 seconds each. However, calendar years have either 365 days (common year) or 366 days (leap year). A leap year occurs every four years. Each of these years have 12 months, which have 28-31 days. Each day has 24 hours, one hour is 60 minutes and one minute is 60 seconds.