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The basic answer is that they changed because the Government at the time wanted so. Usually rules based on the day of the week, such as DST changing the last Sunday of month. But the reasons are ...

Most folks are used to positional numbers meaning they have a position to indicate the number of ones, the number of tens, the number of hundreds, and so on. The common Hindu-Arabic numerals are ...

The use of glass in glazing to protect paintings would appear to date back to the mid 18th century: ...such was the interest in art from the mid eighteenth century, as expressed through ...

In general, they didn't. First off, some terms. Technically a nation is a coherent culture of people, so polyglot empires like Rome's or the Ottoman's don't qualify. It would probably be better to ...

The base-10 Arabic number system you are using in your question also didn't exist back then. It couldn't have because, as you have noticed, the entire concept relies on having the concept of "0". The ...

You are conflating the quantity or number zero, denoting none, with the numeral or symbol explicitly denoting the quantity of none, and represented in our Arabic Numeral system by '0' but also named ...

wartime. States enforced daylight savings through winter and summer both to have more light during the economic working day to reduce production inputs and production costs pre Timezone time. ...

There is no 'golden age of Christmas'. Christmas is an ancient religious as well as a secular festival. Part of it is religious, and part of it is secular. Going to church is the religious part, eat ...

There are some calendars which do have a year zero. The calendar used by astronomers corresponds to the Gregorian and Julian calendars, but does not use AD or BC. Instead it has a year zero, ...

While looking up a map for a recent question I ran into Timemaps, which you might find interesting. It's interactive rather than a poster, and allows to zoom in and out of regions and countries, ...

Are you looking for this timeline? I have a large collection of history timelines. I have 4 Japanese world history timelines in the collection.

Never. “The imaginary” is the general case of a particular cultural location or time commonly imagined by groups of people as a cultural phenomena. For example, much of “the Founding Fathers,” of ...