It is only more than just 90 days from now until we finally complete a year. New year’s resolutions are coming and the holidays magic is brimming but what exactly do we mean when we say we have completed another year around the sun?

The question of how many days in a year may be a bit cliché but we are under-appreciating it. There are various calendar years so when someone asks you how many days in a year, you should know that it is not automatically 365. But how is that possible?

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**How many days in a year exactly?**

Well, we go by the common year or the modern Gregorian calendar as they say. So by this concept we know that there are exactly 365 days in a year. But there are also times when the answer could be relative. Say for example, in a leap year, there will be 366 and for lunar year, it would be 354. So honestly, being exact on the number of days in a year means we also have to exact in what calendar year we are referring to.

1 common year = 365 days

1 leap year = 366 days

1 lunar year = 354

**How many days in a leap year**

According to Entity Mag, one leap year would have 366 days instead of the usual 365. The additional day is what we know as February 29th which only exists once in every four years and it traces back its origin to Julius Caesar who had this fetish of making everything exact but turned out that his measurement of the movement of the earth around the sun was inexact too, hence, the leap year.

1 leap year = 366 days

**How many days in a Gregorian year?**

There are other calendar years and for each of them, the number of days in a year might have slight differences. For example, the Gregorian calendar was the basis of the common calendar, so basically, they count the number of days in a year similarly which is at 365.

1 Gregorian year = 365 days

## How many days in a Lunar year?

The Lunar year on the other hand, measures months depending on the phases of the moon and by this, one lunar year would have 11 days less than the common year because it has 354 days only.

1 lunar year = 354 days

## How many days in a Julian year?

The Julian year on the other hand has a more complex backstory because it follows the time interval of what is considered as Earth days in astronomy. As such, one Julian year would have 365.25 days in it and it only happens once every four years too.

1 Julian year = 365.25 days

**How many days in a sidereal year, a tropical year?**

The sidereal year on the other hand would have 365 days, 6 hours, 9 minutes and 10 seconds to complete a year while the tropical year would have 365 days, 5 hours, 48 minutes and 45 seconds in it.

1 sidereal year = 365 days, 6 hours, 9 minutes and 10 seconds

1 tropical year = 365 days, 5 hours, 48 minutes and 45 seconds

**How many days in a year without weekends?**

Granting that there will be no weekends in a year, there would only be 260-261 days to complete a year according to Kalender.

1 year without weekends =260-261 days

**See also**: How many weeks in a year?

**How many days in a year on Mars, Jupiter, Mercury?**

In terms of days in a year in planets, there would be 687 days in a year on Mars, 4,300 days in Jupiter and 88 days only in Mercury.

1 year on Mars = 687 days

1 year on Jupiter = 4,300 days

1 year on Mercury = 88 days

**Conclusion**

In conclusion, days in the year is a relative concept. The next time someone asks you how many days there are in a year, you better ask them first which calendar year they are talking about. And for the sake of profound conversations, you might entice them with mentioning how many days there are in a year in other planets.