How many days are in a year how many days are there in a year which one right or wrong?

Answer 1

The actual length of a tropical year in 2014 is 365.2421918 days. That time diminishes by 5.3 milliseconds per year. The definition of a tropical year is the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice, etc. Since the points in Earth's orbit where the equinoxes and solstices occur are based on the direction of Earth's tilt, and since the direction of Earth's tilt rotates at about one cycle per 25,800 years, the time it takes Earth to complete one full solar orbit is actually 51.15 seconds longer than a tropical year. That period is called a sidereal year, and it can also be described as the time it takes for the sun to return to the same position in the sky relative to a distant star.

The average length of a year of the Gregorian calendar is 365.2425 days. Due to the difference between 365.2425 days and 365.2422 days, the Gregorian calendar has an error of one day every 3200 years. That is much better than the error of the Julian calendar, which was the main reason for the introduction of the Gregorian calendar and which was one day every 128 years (the average length of a year of the Julian calendar is 365.25 days).

Most years of the Gregorian calendar have 365 days, but leap years have 366 days. The rules for which years are leap years are...

A year is a leap year if it is evenly divisible by 4 (like 2012 or 2016), UNLESS...

it is also evenly divisible by 100 (like 1900 or 2100), in which case it is not a leap year, UNLESS...

it is also evenly divisible by 400 (like 2000 or 2400), in which case it is a leap year.

The difference between a leap year and a regular year is the 29th of February.

Oh, now I understand the question; they're both right.

Answer 2

There are 365 days in a year unless it is a leap year, then there is 366.