# How Many Months Have 28 Days?

Contents

- 0.1 Which month has 28 days?
- 0.2 How many months have 28 days and similar questions?
- 0.3 How many months have 31 days and 28 days?
- 0.4 Why are months 28 days?
- 1 Which month has 29 days?
- 2 Which month has 29 days?

### Which month has 28 days?

Why Are There Only 28 Days in February? © Tanusha/Fotolia Each month in the modern consists of at least 28 days. That number would be a nicely rounded 30 were it not for, While every month besides the second in the calendar contains at least 30 days, February falls short with 28 (and 29 on a leap year).

So why is the most widely used calendar in the world so inconsistent in the lengths of its months? And why is February stuck with the fewest number of days? Blame it on Roman superstition. The Gregorian calendar’s oldest ancestor, the first Roman calendar, had a glaring difference in structure from its later variants: it consisted of 10 months rather than 12.

In order to fully sync the calendar with the lunar year, the Roman king added January and February to the original 10 months. The previous calendar had had 6 months of 30 days and 4 months of 31, for a total of 304 days. However, Numa wanted to avoid having even numbers in his calendar, as Roman superstition at the time held that even numbers were unlucky.

He subtracted a day from each of the 30-day months to make them 29. The lunar year consists of 355 days (354.367 to be exact, but calling it 354 would have made the whole year unlucky!), which meant that he now had 56 days left to work with. In the end, at least 1 month out of the 12 needed to contain an even number of days.

This is because of simple mathematical fact: the sum of any even amount (12 months) of odd numbers will always equal an even number—and he wanted the total to be odd. So Numa chose February, a month that would be host to Roman rituals honoring the dead, as the unlucky month to consist of 28 days.

### How many months have 28 days and similar questions?

All twelve months of the year have at least 28 days. However, February is the only month that always has exactly 28 days, except for leap years when it has 29 days.

### How many months have 31 days and 28 days?

How Many Have 28, 29, 30, or 31 Days? – The Gregorian calendar has 4 months that are 30 days long and 7 months that are 31 days long. February is the only month that is 28 days long in common years and 29 days long in leap years.

#### Why do some months have 31 30 29 or 28 days?

Professor Helen Parish answers the question of why February has the least number of days as part of the Curious Kids series by The Conversation that gives children the chance to have their questions about the world answered by experts. Why does February has the least number of days? Why does it not have 30 or 31 days like the rest of the eleven months? – Simi, aged 15, Mauritius The reason February is shorter than other months comes down to the history of how we measure and divide the year.

- We know that the Earth takes 365 days and just under six hours to go around the Sun,
- The division of those days into twelve months is a human invention to measure time.
- But it hasn’t always been divided that way.
- In the first surviving ancient Roman calendar, there were ten months.
- The calendar was shaped by the agricultural year, so began in spring with March and ended 304 days later in December.

There was no work to be done in the fields during the two months of winter, and the rest of days in the year were simply not counted in the calendar. In 731BC Numa Pompilius, the second king of Rome, decided to line the calendar up with the phases of the moon.

There are 12 cycles of the moon each year, so the calendar was divided into twelve months. January and February were added and the new calendar year lasted 355 days. The Romans believed that even numbers were unlucky, so the length of the months in Pompilius’ calendar alternated between 29 or 31 days.

However, the length of the calendar year meant that the final month – February – was left with only 28. In Rome, February was linked with rituals of purification, or februum – giving it its name. During the festival of Lupercalia purification ceremonies took place to prepare buildings and people for the feasts and sacrifices of the festival.

During the festival of Feralia food and gifts were brought to cemeteries, to honour the dead and keep them happy so they would not rise and haunt the living. However, a calendar year lasting 355 days created its own problems. Because the Earth takes longer than this to go round the Sun, as years went by the months and the seasons started to fall out of alignment.

So an extra month called Mercedonius was added to the calendar before the start of March. Mercedonius was not used every year. It was added whenever it was necessary to re-align the months and the seasons. It had either 27 or 28 days, creating a year that lasted for either 377 or 378 days.

#### What months have 28 or 29 days?

The table below shows the months of the year used in English-speaking countries and many other parts of the world. The list shows the order of the months, starting from January (month 1). The abbreviations or short forms shown are the most common, but other abbreviations are possible, for example: Ja./Fe./Ma.

- Or J./F./M.
- The days column shows the number of days in the month.
- All months have 30 or 31 days, except for February which has 28 days (29 in a leap year).
- Every fourth year, the month of February has 29 days instead of 28.
- This year is called a “leap year” and the 29th day of February is a “leap day”.

A leap year has 366 days instead of the usual 365. Most years that can be cleanly divided by four are leap years.2016, 2020 and 2024, for example, are leap years.

month | short form | days | season | |
---|---|---|---|---|

1 | January | Jan. | 31 | winter |

2 | February | Feb. | 28/29 | |

3 | March | Mar. | 31 | spring |

4 | April | Apr. | 30 | |

5 | May | May | 31 | |

6 | June | Jun. | 30 | summer |

7 | July | Jul. | 31 | |

8 | August | Aug. | 31 | |

9 | September | Sep. | 30 | autumn |

10 | October | Oct. | 31 | |

11 | November | Nov. | 30 | |

12 | December | Dec. | 31 | winter |

The seasons are approximate and depend on latitude. Some parts of the world have only three seasons. The seasons shown here are for the North Temperate Zone (for example North America). In the southern hemisphere, the seasons are reversed. EnglishClub : Learn English : Vocabulary : Topic : Time : Months of the Year

### Why are months 28 days?

Why does February have 28 days?

- Why is February such a short month, with just 28 days?
- If you want a super-quick answer to this, then – perhaps surprisingly – the fact that February has 28 days is based on nothing more scientific than Roman superstition.
- But you’d probably like a little more explanation than that, so let’s dive in

The Roman calendar divided the year based on lunar cycles. Credit: iStock

- Now that pretty much the entire world uses the Gregorian calendar, we tend to think of its division of the year into months as being somehow carved in stone, but that is far from the case.
- Before there was the Gregorian calendar, there was the Julian calendar – still used in Turkey until as recently as 1927 – and before that there was the Roman calendar.
- The latter originally divided the year from March to December into 10 months of either 29 or 31 days, based on, with the early part of the year simply left unnamed.
- No crops could be planted or harvested during this time, so it wasn’t considered important.
- Later, the Roman king Numa Pompilius added two ‘new’ months, January and February, to ensure that the calendar covered the full year.

Numa Pompilius Giving the Laws to the Romans, n.d. Possibly by Giovanni Battista Galestruzzi. Photo by Heritage Art/Heritage Images via Getty Images The reason there were always 29 or 31 days, never 30, was simply that the Romans considered even numbers unlucky.

- Unfortunately, 12 times (any odd number) is always an even number.
- To make the number of days on the calendar add up to 365 in a year, there would have to be one month with an even number.
- February was chosen to have 28 days as this was when the Romans honoured their dead.
- Presumably they figured you don’t get much unluckier than being dead, so what harm could it do? Later, Julius Caesar rearranged the calendar to reflect the ‘movements’ of the Sun rather than the lunar cycle, while his Julian calendar would itself be fine-tuned on the orders of Pope Gregory XIII in 1583 to give us the Gregorian calendar we know today.

But somehow, little old February with its unique 28-day length survived all these changes. Except in Leap Years, of course, when it becomes the lucky recipient of a whole extra day. When exactly those Leap Years happen, of course, is one of the key differences between the various calendars mentioned above – but that’s a story for another day : Why does February have 28 days?

## Which month has 29 days?

Gregorian calendar – See also: An image showing which century years are leap years in the Gregorian calendar In the Gregorian calendar, the standard calendar in most of the world, almost every fourth year is a leap year. Each leap year, the month of February has 29 days instead of 28.

Adding one extra day in the calendar every four years compensates for the fact that a period of 365 days is shorter than a by almost 6 hours. However, this correction is excessive and the modified the Julian calendar’s scheme of leap years as follows: Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400.

For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. Whereas the Julian calendar year incorrectly summarized Earth’s tropical year as 365.25 days, the Gregorian calendar makes these exceptions to follow a calendar year of 365.2425 days.

- This more closely resembles a mean tropical year of 365.2422 days.
- Over a period of four centuries, the accumulated error of adding a leap day every four years amounts to about three extra days.
- The Gregorian calendar therefore omits three leap days every 400 years, which is the length of its leap cycle,

This is done by omitting 29 February in the three century years (multiples of 100) that are not multiples of 400. The years 2000 and 2400 are leap years, but not 1700, 1800, 1900, 2100, 2200 and 2300. By this rule, an entire leap cycle is 400 years which total 146,097 days, and the average number of days per year is 365 + 1 ⁄ 4 − 1 ⁄ 100 + 1 ⁄ 400 = 365 + 97 ⁄ 400 = 365.2425.

This graph shows the variations in date and time of the, |

The Gregorian calendar was designed to keep the on or close to 21 March, so that the date of (celebrated on the Sunday after the ecclesiastical that falls on or after 21 March) remains close to the vernal equinox. The “” section of the “” article discusses how well the Gregorian calendar achieves this design goal, and how well it approximates the,

### Which months have 30 days?

Answer 1) There are 12 months in a year namely January, February, March, April, May, June, July, August, September, October, November, and December. Answer 2) There are 4 months in a year having 30 days namely April, June, September, and November. Answer 3) There are 7 months in a year having 31 days namely January, March, May, July, August, October, and December.

#### Which month has 28 days and 4 years?

Currently logged out. Login Currently logged out. Login Home / Blog / Why Does February Have 28 Days? Save In Indiana, February brings on long and cold days. After surviving the cold temperatures and inclement weather of December and January, Hoosiers impatiently wait for March to welcome spring. And each year, the small amount of hope we have is that February won’t last too long.

- After all, it is two to three days shorter than every other month.
- This got us thinking, why does February only have 28 – and sometimes 29 – days anyway? Today, we answer that question with help from Slate and mental_floss,
- February’s 28 days date back to the second king of Rome, Numa Pompilius.
- Before he became king, Rome’s lunar calendar was just 10 months long.

It began in March and ended in December. At the time, Romulus, the first king of Rome, and his people found the time between December and March to be unimportant because it had nothing to do with the Harvest. When Numa Pompilius took reign, he decided to make the calendar more accurate by lining it up with the year’s 12 lunar cycles.

The new 355-day year needed two additional months to make up for the lost time. So he added January and February to the end of the calendar. Because Romans believed even numbers to be unlucky, each month had an odd number of days, which alternated between 29 and 31. But, in order to reach 355 days, one month had to be an even number.

February was chosen to be the unlucky month with 28 days. According to Slate, this choice may be due to the fact that Romans honored the dead and performed rites of purification in February. In fact, the word februare means “to purify” in the dialect of the ancient Sabine tribe.

- After a few years of using the Numa Pompilius’ new 355-day calendar, the seasons and months began to fall out of sync.
- In an attempt to realign the two, the Romans added a 27-day leap month as needed.
- If Mercedonius was used, it began on February 24.
- Because the leap month was inconsistent, this too had its obvious flaws.

In 45 B.C., Julius Caesar commissioned an expert to create a sun-based calendar like the one the Egyptians used. The Julian Calendar added a little more than 10 days to each year, making each month either 30 or 31 days long, except for February. To account for the entire 365.25 day-long year, one day was added to February every four years, now known as a “leap year.” During most years, this left February with just 28 days.

### Why February is 28 days?

It is said Romans believed that even numbers are unlucky. And that’s why each month had either 29 or 31 days. But to reach 355 days, one month had to be even. And thus, February was selected to be the month with 28 days.

#### Why are there 28 31 days in a month?

Have You Ever Wondered. –

Why don’t all months have the same number of days? Where does the concept of the month come from? Which ancient civilization’s calendar is our current calendar based upon?

Today’s Wonder of the Day was inspired by Quinn. Quinn Wonders, ” Why is there certain amount of days in a month ” Thanks for WONDERing with us, Quinn! Do you know anyone who has a birthday on February 30? How about September 31? Maybe October 32 or November 31? No? Well, there’s a good reason for that and you’ve probably already guessed it: those aren’t even real days! If you check your calendar, you’ll notice that February only has 28 days (unless it’s a leap year ), September only has 30 days, October only has 31 days, and November only has 30 days.

- What’s the deal with that? Have you ever WONDERed why all the months of the year don’t have the same number of days? To solve this mystery, we must dig deep into the history of our modern calendar, which is known as the Gregorian calendar,
- The Gregorian calendar was a modification of the Julian calendar, which itself was a modification of the ancient Roman calendar,

The ancient Romans, like ancient civilizations before them, based their concept of the month on the Moon, Unfortunately, the lunar cycle is approximately 29.5 days, which does not divide evenly into the 365.25 days that make up a year, As a result, the earliest ancient Roman calendars had months that were either 29 or 30 days.

- To make things even more confusing, the ancient Romans borrowed from the ancient Greeks to develop the idea of a 10- month calendar that left approximately 60 days unaccounted for.
- For example, the ancient Romans started using a 10- month calendar in 738 B.C.
- That included the following months: Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, and December.

The names Quintilis through December derived from the Latin words for five through ten. To account for the remaining 60 or so days, Januarius was added to the beginning of the year and Februarius to the end of the year during Numa’s reign around 700 B.C.

The calendar stayed in that order until 452 B.C. when a small council of Romans, called the Decemvirs, moved February to follow January. Julius Caesar modified the Roman calendar in 46 B.C. to make each month have either 30 or 31 days, with the exception of Februarius, which had 29 days and gained an extra day every fourth year,

Quintilis was later renamed Julius in his honor. Likewise, Sextilis later became Augustus to honor Augustus Caesar. Augustus was also given an extra day (taken away from Februarius), so that Augustus and Julius would have an equal number of days. So the next time you’re curious about why a particular month has the number of days that it does, you can thank the Moon and the ancient Romans!

### Why do we have 12 months?

Why are there 12 months in the year? – Julius Caesar’s astronomers explained the need for 12 months in a year and the addition of a leap year to synchronize with the seasons. At the time, there were only ten months in the calendar, while there are just over 12 lunar cycles in a year,

#### Which months have 30 31 and 28 days?

Answer and Explanation: Only four of our 12 months have exactly 30 days: April, June, September, and November. There are seven months with 31 days: January, March, May, July, August, October, and December. February is the oddball, with only 28 days, except in leap years when it has 29.

### What country has 13 months in a year?

Ethiopia, the country that follows a 13-month calendar, and is 7 years behind the rest of the world! Ethiopia might not come to your mind when you think of a place for a vacation, and that’s where you will be going wrong. It is one of the most intriguing places that we know of, and there is enough to support the fact. The country is a melting pot of scenic natural wonders, fascinating history, rare wildlife, and deep-rooted identity.

- In short, visiting Ethiopia is like a trip back in time.
- It is one of the most scenically beautiful and fertile countries in Africa, which is exactly the opposite of the presumed notion of being famine and drought infected.
- Its landscape is graced with things as diverse as castles, deserts, rare wildlife, and much more, you must be wondering why Ethiopia is an underrated travel destination.

Well, this is because many are not aware of some of the mind-blowing facts about this country. Read on to know more. 13 months in a year There are many cultures around the world that have and follow their own calendars, which is exactly not the same as the Western Gregorian calendar. However, despite that, they abide by the rule of 12 months a year. An Ethiopian year is comprised of 13 months, and is seven years behind the Gregorian calendar.

- Coffee originated here

While the first 12 months have 30 days, the last month, called Pagume, has five days and six days in a leap year.Till date, Ethiopia uses its ancient calendar, which hardly creates any inconvenience for travellers because of the calendar difference. However, most Ethiopians these days are now aware of the Gregorian calendar, and some even use both calendars interchangeably.Ethiopia, being one of the few countries in the world, still uses its own calendar system. It is believed that a goat herder way back, centuries ago, noticed that his flock is attracted to a certain kind of bush, and later decided to try it for himself one day. Well, after that day, his herding capability significantly improved and made him more efficient. Legends say that coffee industry took it off from here. So, now you know the origin of your morning coffee shots.

- Land of the oldest people
- A haven for vegetarians

As per various archaeological findings, the Afar region in Ethiopia suggests in several ways that the country might be the place, from where we originated. In 1974, Lucy was discovered here, a 3.2-million-year-old hominid skeleton, which makes it the oldest fossilised skeleton. The dominant religion that people follow here is orthodox Christianity. This means that those who follow this religion, which will be around half the population, fast for 200-250 days a year approximately. The way they fast is not the way you will imagine, fasting for Ethiopian means instead of abstaining from eating, they abstain from all animal products, i.e., eggs, meat, dairy.

- Absolute Independence

It is the only African country that has never been under the colonial control—and it is a fact that the locals will never get tired of boasting. The Italians managed to colonise it in 1935 and remained to rule the country with the military for six years.

#### Why don t we have 13 months with 28 days?

Why aren’t there 13 months, each with 28 days? There are 13 lunations, each with 28 days, that is the moon’s phases around the earth but it doesn’t fit exactly in the rotation of the earth around the sun which is 365 days, not 364, so calendars have never matched.

#### Why 30 days in a month?

One Lunar cycle is the 29.53 days it takes for the Moon to revolve around the Earth. A month is one such Moon cycle rounded up to 30 days.

#### Why August has 31 days?

The Month – Roman Emperor Augustus Caesar, after whom August is named This month was first called Sextilis in Latin, because it was the sixth month in the old Roman calendar, The Roman calendar began in March about 735 BC with Romulus, October was the eighth month.

- August was the eighth month when January or February were added to the start of the year by King Numa Pompilius about 700 BC.
- Or, when those two months were moved from the end to the beginning of the year by the decemvirs about 450 BC (Roman writers disagree).
- In 153 BC January 1 was determined as the beginning of the year.

August is named for Augustus Caesar who became Roman consul in this month. The month has 31 days because Julius Caesar added two days when he created the Julian calendar in 45 BC, August is after July and before September. August, in either hemisphere, is the seasonal equivalent of February in the other.

- In the Northern hemisphere it is a summer month and it is a winter month in the Southern hemisphere,
- No other month in common years begins on the same day of the week as August, but August begins on the same day of the week as February in leap years,
- August ends on the same day of the week as November every year, as each other’s last days are 13 weeks (91 days) apart.

In common years, August starts on the same day of the week as March and November of the previous year, and in leap years, June of the previous year. In common years, August finishes on the same day of the week as March and June of the previous year, and in leap years, September of the previous year.

In common years immediately after other common years, August starts on the same day of the week as February of the previous year. In years immediately before common years, August starts on the same day of the week as May of the following year, and in years immediately before leap years, October of the following year.

In years immediately before common years, August finishes on the same day of the week as May of the following year, and in years immediately before leap years, February and October of the following year.

#### Is a month 30 days or 4 weeks?

Are there 4 Weeks in a Month? – All the months in the calendar have 4 complete weeks because every month has at least 28 days. A few months have some extra days, but they are not counted as a week because these extra days are not enough to sum up to 7 days. (1 week = 7 days).

#### Why do months have 30 or 31 days?

Caesar decided to reform the calendar. It was well known that the year was 365.25 days long, so he knew he needed to add an extra 10 days to the calendar. He simply decided to add a couple of days to some months, and those are the month lengths we still have today.

### What if we had 13 months?

If we added a 13th month to the calendar, then it would take the earth only 12/13 of a year to travel around the sun instead of taking a 1 year as it now does. This has a lot of implications including that summer could occur in any of the 13 months. Seasons would rotate through the months.

### Which months have 30 31 and 28 days?

Answer and Explanation: Only four of our 12 months have exactly 30 days: April, June, September, and November. There are seven months with 31 days: January, March, May, July, August, October, and December. February is the oddball, with only 28 days, except in leap years when it has 29.

## Which month has 29 days?

Gregorian calendar – See also: An image showing which century years are leap years in the Gregorian calendar In the Gregorian calendar, the standard calendar in most of the world, almost every fourth year is a leap year. Each leap year, the month of February has 29 days instead of 28.

Adding one extra day in the calendar every four years compensates for the fact that a period of 365 days is shorter than a by almost 6 hours. However, this correction is excessive and the modified the Julian calendar’s scheme of leap years as follows: Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400.

For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. Whereas the Julian calendar year incorrectly summarized Earth’s tropical year as 365.25 days, the Gregorian calendar makes these exceptions to follow a calendar year of 365.2425 days.

This more closely resembles a mean tropical year of 365.2422 days. Over a period of four centuries, the accumulated error of adding a leap day every four years amounts to about three extra days. The Gregorian calendar therefore omits three leap days every 400 years, which is the length of its leap cycle,

This is done by omitting 29 February in the three century years (multiples of 100) that are not multiples of 400. The years 2000 and 2400 are leap years, but not 1700, 1800, 1900, 2100, 2200 and 2300. By this rule, an entire leap cycle is 400 years which total 146,097 days, and the average number of days per year is 365 + 1 ⁄ 4 − 1 ⁄ 100 + 1 ⁄ 400 = 365 + 97 ⁄ 400 = 365.2425.

This graph shows the variations in date and time of the, |

The Gregorian calendar was designed to keep the on or close to 21 March, so that the date of (celebrated on the Sunday after the ecclesiastical that falls on or after 21 March) remains close to the vernal equinox. The “” section of the “” article discusses how well the Gregorian calendar achieves this design goal, and how well it approximates the,

### Which month has 30 days?

Answer 1) There are 12 months in a year namely January, February, March, April, May, June, July, August, September, October, November, and December. Answer 2) There are 4 months in a year having 30 days namely April, June, September, and November. Answer 3) There are 7 months in a year having 31 days namely January, March, May, July, August, October, and December.