Is over there a factor why months alternate between 30 and 31 days? 365.24/12 = 30.23666; there are many ways to allocate the .2366 days among the months. Why was this chosen?Is over there a factor why July and August hurt this rule?Generally months v 31 and 30 job come in alternating fashion other than for July and also August which space consecutive. For this reason why lock both have actually 31 days? and also who designed that calendar?

The answers have the right to probably only be discovered through historical sources and methods,


*

*

First, the answer come your second question.

You are watching: July and august have 31 days

ho developed that calender?

The existing calendar that most of the western world uses is Gregorian Calendar1, i m sorry is an development over Julian Calendar, i beg your pardon itself to be an advancement over classic Roman Calendar.

Now, on to the an initial question.

Generally months with 31 and also 30 work come in alternate fashion other than for July and August which space consecutive. Therefore why do they both have 31 days?

To price this, we require to an initial look right into the bsci-ch.org of roman Calendar. The first roman calendar meeting to legendary Romulus had 10 months, and it began from Martius, i.e. The month we speak to March. And that deserve to still be viewed in the modern-day calendar today. September, October, November, and also December are 9th, 10th, 11th and 12th month respectively, but Sept comes from Latin for 7, Oct is for 8, and so on.

After that, there to be a pair of (minor) changes to the roman inn Calendar prior to the advent of Julian Calendar. At that time, there were 12 months, v Iunarius and also Februarius, new months included before Martius. And yet, an ordinary year had 355 days, however, a tropic solar year, i.e. The period of Earth"s change around the Sun, is around 365.25 days. Therefore, prior to this time, Romans offered to include a month called Mensis Intercalaris the 27/28-days between Februarius and also Martius to balance this. (the in-depth scheme deserve to be checked out in the wikipedia post on Julian Calendar).

To change this, the calendar was significantly overhauled under the power of Julius Caesar. Among the results of this reform was Quintilis (Quint - 5; so now the 7th month), which currently had 31 days, kept 31 days; and also Sextilis (Sex - 6; so now the 8th month), which previously had 29 days, got a boost of 2 days and also now had 31 days.If one is curious, the net adjust was January (Iunarius), Sextilis (August), and also December got 2 work each, whereas Aprilis (April), Iunius (June), September, and also November got 1 day each.

Now because that the names of these months. After ~ the death of Julius Caesar, Quintilis was renamed to Julius in his honor, which is the origin of July. Similarly, Sextilis was renamed come Augustus in the honor of then reigning emperor Augustus.

See more: How Many Cups In 1 Kilo Of Flour (Apf) Kg, How Many Kg Are In A Unit

Interestingly, subsequent emperors Tiberius, Caligula, Domitian and also Commodus (unsuccessfully) tried come rename September after ~ themselves, yet failed.

1 Technically, existing calendar - the UTC is a further modification of Gregorian Calendar, because a Leap 2nd is occasionally added, to save the time of day close to average solar time. But for all practical purposes, it"s not substantially different native Gregorian Calendar.