Top 13 How Long Is 12 Hours Best 228 Answer

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How long is 12 hours in a day?

Hour to Day Conversion Table

Hours	Days
9 hr	0.375 day
10 hr	0.416667 day
11 hr	0.458333 day
12 hr	0.5 day

Is 12 hours a full day?

Hipparchus proposed dividing the day equally into 24 hours which came to be known as equinoctial hours (because they are based on 12 hours of daylight and 12 hours of darkness on the days of the Equinoxes).

What time is it when its 12 hours?

The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to “before midday”) and p.m. (from Latin post meridiem, translating to “after midday”).
…
12-hour clock.

12-hour	24-hour
12:01 p.m.	12:01
1:00 p.m.	13:00
11:00 p.m.	23:00
11:59 p.m.	23:59

How long is 24 hours a day?

24 hours are divided into two parts — a day lasting 12 hours and a night lasting 12 hours. 1 hour contains 60 minutes, which also have 60 seconds each. Each second is then divided into 1000 milliseconds.

How many hours are in a night?

5 answers. there are 12 hours in one night.

Is a day 12 or 24 hours?

Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Lomb. “Night-time was divided in 12 hours, based on the observations of stars.

How many times a day is every 12 hours?

It is usually taken every 12 hours (twice a day) or every 8 hours (three times a day) with or without food. The length of your treatment depends on the type of infection that you have. Take amoxicillin at around the same times every day.

How many hours are in a whole day?

On Earth, a solar day is around 24 hours. However, Earth’s orbit is elliptical, meaning it’s not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter.

What are the hours in a day?

There are 24 hours in a day.

Is 12 am night or day?

There are no standards established for the meaning of 12am and 12pm. It is often said that 12am Monday is midnight on Monday morning and 12pm is midday. This puts all the times beginning with 12 and ending with am in the same one-hour block, similarly with those ending with pm.

Is midnight 12 am or PM?

When most people say 12pm, typically they’re talking about the middle of the day: 12 noon. When they say 12am, they normally mean 12 midnight.

How do you count 24 hours?

A 24-hour clock typically uses the numbers 0-23, where 00:00 indicates midnight, and a day runs from midnight to midnight over the course of 24 hours.

Why is there 60 seconds in a minute?

THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.

How long is a second?

Since 1967, the second has been defined as exactly “the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom” (at a temperature of 0 K and at mean sea level).

What does 00 mean in time?

24-hour clock

24-hour clock	12-hour clock
00:00	12:00 (midnight) 12:00 a.m. (start of the day)
01:00	1:00 a.m.
02:00	2:00 a.m.
…	…

How much of a day is 12 hours?

Answer: 12 hours is half (1/2) a day.

How many times a day is every 12 hours?

Is 24 hours a whole day?

However, 24 hours is only the length of one Earth day on average; in reality, most days are either longer or shorter. Although it takes Earth 23 hours and 56 minutes and 4.09 seconds to spin 360 degrees on its axis,…

Is a day exactly 24 hours?

Day Length

On Earth, a solar day is around 24 hours. However, Earth’s orbit is elliptical, meaning it’s not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter.

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Hours to Days Conversion (hr to day)

Enter the time in hours below to get the value converted to days.

Do you want to convert days to hours

How to Convert Hours to Days

To convert an hour measurement to a day measurement, divide the time by the conversion ratio.

Since one day is equal to 24 hours, you can use this simple formula to convert:

days = hours ÷ 24

The time in days is equal to the hours divided by 24.

For example, here’s how to convert 5 hours to days using the formula above. 5 hr = (5 ÷ 24) = 0.208333 day here’s how to convert 5 hours to days using the formula above.

Hours and days are both units used to measure time. Keep reading to learn more about each unit of measure.

Why is a day divided into 24 hours? (Intermediate)

December 2003 answer: It appears that the Egyptians were responsible for the 24 hour day. The Eqyptians were fond of counting in base twelve (instead of base 10 which is commonly used today). This is thought to be because they counted finger joints instead of fingers. Each of your fingers has three joints, so if you count by pointing to finger joints with your thumb you can count to twelve on each hand. This might seem arbitrary, but is actually just a strange as counting in base ten simply because we have ten digits.

(Feb 2004 Update: Thanks to a “Curious” reader for pointing out that another reason the Egyptians (and Indians) liked counting in base 12 is that 12 has a larger number of integer factors than 10. ie. 12/6=2, 12/4=3, 12/3=4, 12/2=6, while 10/5=2 and 10/2=5 are all there are for the number 10).

The Egyptians divided the clock into 12 hours of daytime and 12 hours of night-time (or alternatively 10 hours between sunrise and sunset, an hour for each twilight period and 12 hours of darkness). This is known because of various sundials from the period which have been found to be marked with hours. Interestingly this means that hours started out changing in length with the seasons (as the amount of daylight vs. darkness changes).

There is a more in-depth explanation for the division of night-time into 12 hours which is based on the number of “decan” stars which were seen to rise during summer nights in Ancient Egypt. A “decan” star was a star which rose just before sunrise at the beginning of a 10-day “decade” in Ancient Egypt. 36 “decan” stars marked the passage of a year for the Egyptians (or 36 10 day periods). During summer nights, 12 decan stars rose – one for each “hour”.

However, hours did not have a fixed length until the Greeks decided they needed such a system for theoretical calculations. Hipparchus proposed dividing the day equally into 24 hours which came to be known as equinoctial hours (because they are based on 12 hours of daylight and 12 hours of darkness on the days of the Equinoxes). Ordinary people continued to use the seasonally varying hours for a long time. Only with the advent of mechanical clocks in Europe in the 14th Century, did the system we use today become common place.

Follow-up question (Apr 2006): How come there are 36 decan stars but only 12 in a night. Why aren’t there 18 each night? Are some of the decan stars below the southern horizon part of the year. I don’t understand how 36 of them equal 24 hours; it seems to me they’d equal 24/36 = 2/3 hour each. What am I missing here?

There was not a decan star every modern hour. Remember that the length of darkness in the summer is actually less than 12 “modern” hours. The Egyptian “hours” marked by the rising of each of the 12 decan stars were shorter than what we call an hour now. As I said, hours did not have a fixed length until much later when people decided that would be useful! Initially 12 hours was always the length of night/day, but the hours themselves changed in length with the seasons, and a nighttime hour would have been different to a daytime hour! The “hours” in this era were only equal to our current hours on the equinoxes.

Is there a list of the decan stars somewhere?

I could not find a list of decan stars (or star groups in some cases), in modern terminology. A list of them in Egyptian terms is here.

This page was last updated on June 27, 2015.

12-hour clock

Time counting system

“AM and PM” redirects here. For other uses, see AM PM

The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to “before midday”) and p.m. (from Latin post meridiem, translating to “after midday”).[1][2] Each period consists of 12 hours numbered: 12 (acting as 0),[3] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11.

The daily cycle starts at 12 midnight, runs through 12 noon, and continues until just before midnight at the end of the day. There is no widely accepted convention for how midday and midnight should be represented. The 12-hour clock was developed from the second millennium BC and reached its modern form in the 16th century AD.

The 12-hour time convention is common in several English-speaking nations and former British colonies, as well as a few other countries.

History and use [ edit ]
The natural day-and-night division of a calendar day forms the fundamental basis as to why each day is split into two cycles. Originally there were two cycles: one cycle which could be tracked by the position of the Sun (day), followed by one cycle which could be tracked by the Moon and stars (night). This eventually evolved into the two 12-hour periods which are used today, one called “a.m.” starting at midnight and another called “p.m.” starting at noon. Noon itself is rarely abbreviated today; but if it is, it is denoted “m.”[1]
The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt.[4] Both an Egyptian sundial for daytime use[5] and an Egyptian water clock for night-time use were found in the tomb of Pharaoh Amenhotep I.[6] Dating to c. 1500 BC, these clocks divided their respective times of use into 12 hours each.

The Romans also used a 12-hour clock: daylight was divided into 12 equal hours (thus hours having varying length throughout the year) and the night was divided into four watches.

The first mechanical clocks in the 14th century, if they had dials at all, showed all 24 hours using the 24-hour analog dial, influenced by astronomers’ familiarity with the astrolabe and sundial and by their desire to model the Earth’s apparent motion around the Sun. In Northern Europe these dials generally used the 12-hour numbering scheme in Roman numerals but showed both a.m. and p.m. periods in sequence. This is known as the double-XII system and can be seen on many surviving clock faces, such as those at Wells and Exeter.

Elsewhere in Europe, numbering was more likely to be based on the 24-hour system (I to XXIV). The 12-hour clock was used throughout the British empire.

During the 15th and 16th centuries, the 12-hour analog dial and time system gradually became established as standard throughout Northern Europe for general public use. The 24-hour analog dial was reserved for more specialized applications, such as astronomical clocks and chronometers.

Most analog clocks and watches today use the 12-hour dial, on which the shorter hour hand rotates once every 12 hours and twice in one day. Some analog clock dials have an inner ring of numbers along with the standard 1-to-12 numbered ring. The number 12 is paired either with a 00 or a 24, while the numbers 1 through 11 are paired with the numbers 13 through 23, respectively. This modification allows the clock to also be read in 24-hour notation. This kind of 12-hour clock can be found in countries where the 24-hour clock is preferred.

Use by country [ edit ]
In several countries the 12-hour clock is the dominant written and spoken system of time, predominantly in nations that were part of the former British Empire, for example, the United Kingdom, Republic of Ireland, the United States, Canada (excluding Quebec), Australia, New Zealand, South Africa, India, Pakistan, and Bangladesh,and others follow this convention as well, such as Mexico and the former American colony of the Philippines. In most countries, however, the 24-hour clock is the standard system used, especially in writing. Some nations in Europe and Latin America use a combination of the two, preferring the 12-hour system in colloquial speech but using the 24-hour system in written form and in formal contexts.

The 12-hour clock in speech often uses phrases such as … in the morning, … in the afternoon, … in the evening, and …at night. Rider’s British Merlin almanac for 1795 and a similar almanac for 1773 published in London used them.[7] Other than in English-speaking countries and some Spanish-speaking countries, the terms a.m. and p.m. are seldom used and often unknown.

Computer support [ edit ]
In most countries, computers by default show the time in 24-hour notation. Most operating systems, including Microsoft Windows and Unix-like systems such as Linux and macOS, activate the 12-hour notation by default for a limited number of language and region settings. This behaviour can be changed by the user, such as with the Windows operating system’s “Region and Language” settings.[8]
Abbreviations [ edit ]
p.m. with a dot to the left of the hour Typical digital 12-hour alarm clock indicatingwith a dot to the left of the hour

The Latin abbreviations a.m. and p.m. (often written “am” and “pm”, “AM” and “PM”, or “A.M.” and “P.M.”) are used in English and Spanish.[9] The equivalents in Greek are π.μ. and μ.μ., respectively, and in Sinhala පෙ.ව. (pe.va.) for පෙරවරු (peravaru, පෙර pera – fore, pre) and ප.ව. (pa.va.) for පස්වරු (pasvaru, පස්සේ passē – after, post). However, noon is rarely abbreviated in any of these languages, noon normally being written in full. In Portuguese, there are two official options and many others used, for example, using 21:45, 21h45 or 21h45min (official ones) or 21:45 or 9:45 p.m. In Irish, a.m. and i.n. are used, standing for ar maidin (“in the morning”) and iarnóin (“afternoon”) respectively.

Most other languages lack formal abbreviations for “before noon” and “after noon”, and their users use the 12-hour clock only orally and informally.[citation needed] However, in many languages, such as Russian and Hebrew, informal designations are used, such as “9 in the morning” or “3 in the night”.

When abbreviations and phrases are omitted, one may rely on sentence context and societal norms to reduce ambiguity. For example, if one commutes to work at “9:00”, 9:00 a.m. may be implied, but if a social dance is scheduled to begin at “9:00”, it may begin at 9:00 p.m.

Related conventions [ edit ]
Typography [ edit ]
The terms “a.m.” and “p.m.” are abbreviations of the Latin ante meridiem (before midday) and post meridiem (after midday). Depending on the style guide referenced, the abbreviations “a.m.” and “p.m.” are variously written in small capitals (“am” and ” pm”),[citation needed] uppercase letters without a period (“AM” and “PM”), uppercase letters with periods, or lowercase letters (“am” and “pm” or,[10] “a.m.” and “p.m.”).[citation needed] With the advent of computer generated and printed schedules, especially airlines, the “M” character is often omitted as providing no additional information as in “9:30A” or “10:00P”.[citation needed]
Some style guides suggest the use of a space between the number and the a.m. or p.m. abbreviation.[citation needed] Style guides recommend not using a.m. and p.m. without a time preceding it.[11]
The hour/minute separator varies between countries: some use a colon, others use a period (full stop),[10] and still others use the letter h.[citation needed] (In some usages, particularly “military time”, of the 24-hour clock, there is no separator between hours and minutes.[12] This style is not generally seen when the 12-hour clock is used.)

Encoding [ edit ]
Unicode specifies codepoints for “a.m.” and “p.m.” symbols, which are intended to be used only with Chinese-Japanese-Korean (CJK) character sets, as they take up exactly the same space as one CJK character:

U+ 33C2 ㏂ SQUARE AM

U+ 33D8 ㏘ SQUARE PM

Informal speech and rounding off [ edit ]
In speaking, it is common to round the time to the nearest five minutes and/or express the time as the past (or to) the closest hour; for example, “five past five” (5:05). Minutes past the hour means those minutes are added to the hour; “ten past five” means 5:10. Minutes to, ’til and of the hour mean those minutes are subtracted; “ten of five”, “ten ’til five”, and “ten to five” all mean 4:50.

Fifteen minutes is often called a quarter hour, and thirty minutes is often known as a half hour. For example, 5:15 can be phrased “(a) quarter past five” or “five-fifteen”; 5:30 can be “half past five”, “five-thirty” or simply “half five”. The time 8:45 may be spoken as “eight forty-five” or “(a) quarter to nine”.[13]
In older English, it was common for the number 25 to be expressed as “five-and-twenty”.[14] In this way the time 8:35 may be phrased as “five-and-twenty to 9”,[15] although this styling fell out of fashion in the later part of the 1900s and is now rarely used.[16]
Instead of meaning 5:30, the “half five” expression is sometimes used to mean 4:30, or “half-way to five”, especially for regions such as the American Midwest and other areas that have been particularly influenced by German culture. This meaning follows the pattern choices of many Germanic and Slavic languages, including Serbo-Croatian, Dutch, Danish, Russian and Swedish, as well as Hungarian and Finnish.

Moreover, in situations where the relevant hour is obvious or has been recently mentioned, a speaker might omit the hour and just say “quarter to (the hour)”, “half past” or “ten ’til” to avoid an elaborate sentence in informal conversations. These forms are often commonly used in television and radio broadcasts that cover multiple time zones at one-hour intervals.[17]
In describing a vague time of day, a speaker might say the phrase “seven-thirty, eight” to mean sometime around 7:30 or 8:00. Such phrasing can be misinterpreted for a specific time of day (here 7:38), especially by a listener not expecting an estimation. The phrase “about seven-thirty or eight” clarifies this.

Some more ambiguous phrasing might be avoided. Within five minutes of the hour, the phrase “five of seven” (6:55) can be heard “five-oh-seven” (5:07). “Five to seven” or even “six fifty-five” clarifies this.

Formal speech and times to the minute [ edit ]
“O’clock” redirects here. For the o’clock watch, see O bag

Minutes may be expressed as an exact number of minutes past the hour specifying the time of day (e.g., 6:32 p.m. is “six thirty-two”). Additionally, when expressing the time using the “past (after)” or “to (before)” formula, it is conventional to choose the number of minutes below 30 (e.g., 6:32 p.m. is conventionally “twenty-eight minutes to seven” rather than “thirty-two minutes past six”).

In spoken English, full hours are often represented by the numbered hour followed by o’clock (10:00 as ten o’clock, 2:00 as two o’clock). This may be followed by the “a.m.” or “p.m.” designator, though some phrases such as in the morning, in the afternoon, in the evening, or at night more commonly follow analog-style terms such as o’clock, half past three, and quarter to four. O’clock itself may be omitted, telling a time as four a.m. or four p.m. Minutes “:01” to “:09” are usually pronounced as oh one to oh nine (nought or zero can also be used instead of oh). Minutes “:10” to “:59” are pronounced as their usual number-words. For instance, 6:02 a.m. can be pronounced six oh two a.m. whereas 6:32 a.m. could be told as six thirty-two a.m.

Confusion at noon and midnight [ edit ]
It is not always clear what times “12:00 a.m.” and “12:00 p.m.” denote. From the Latin words meridies (midday), ante (before) and post (after), the term ante meridiem (a.m.) means before midday and post meridiem (p.m.) means after midday. Since “noon” (midday, meridies (m.)) is neither before nor after itself, the terms a.m. and p.m. do not apply.[2] Although “12 m.” was suggested as a way to indicate noon, this is seldom done[23] and also does not resolve the question of how to indicate midnight.

The American Heritage Dictionary of the English Language states “By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight.”[27]
E. G. Richards in his book Mapping Time provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight.[28]
The style manual of the United States Government Printing Office used 12 a.m. for noon and 12 p.m. for midnight until its 2008 edition, when it reversed these designations[19][20] and then retained that change in its 2016 revision.[29]
Many U.S. style guides, and NIST’s “Frequently asked questions (FAQ)” web page,[2] recommend that it is clearest if one refers to “noon” or “12:00 noon” and “midnight” or “12:00 midnight” (rather than to “12:00 p.m.” and “12:00 a.m.”). The NIST website states that “12 a.m. and 12 p.m. are ambiguous and should not be used.”

The Associated Press Stylebook specifies that midnight “is part of the day that is ending, not the one that is beginning.”[26]
The Canadian Press Stylebook[24] says, “write noon or midnight, not 12 noon or 12 midnight.” Phrases such as “12 a.m.” and “12 p.m.” are not mentioned at all. Britain’s National Physical Laboratory “FAQ-Time” web page[25] states “In cases where the context cannot be relied upon to place a particular event, the pair of days straddling midnight can be quoted”; also “the terms 12 a.m. and 12 p.m. should be avoided.”

Likewise, some U.S. style guides recommend either clarifying “midnight” with other context clues, such as specifying the two dates between which it falls, or not referring to the term at all. For an example of the latter method, “midnight” is replaced with “11:59 p.m.” for the end of a day or “12:01 a.m.” for the start of a day. That has become common in the United States in legal contracts and for airplane, bus, or train schedules, though some schedules use other conventions. Occasionally, when trains run at regular intervals, the pattern may be broken at midnight by displacing the midnight departure one or more minutes, such as to 11:59 p.m. or 12:01 a.m.[30]
In Japanese usage, midnight is written as 午前0時 (0:00 a.m.) and noon is written as 午後0時 (0:00 p.m.), making the hours numbered sequentially from 0 to 11 in both halves of the day.

In literature [ edit ]
In the George Orwell novel Nineteen Eighty-Four, Winston Smith describes a twelve-hour clock as “old-fashioned”.[31]
See also [ edit ]

So you have finished reading the how long is 12 hours topic article, if you find this article useful, please share it. Thank you very much. See more: how long is 12 hours ago, how long is 12 hours in seconds, how long is 12 hours from 8am, how long is 12 hours in days, how long is 12 hours in minutes, how long is 12 hours from now, how many days is 12 hours a week, 24 hours is how many days

Top 13 How Long Is 12 Hours Best 228 Answer

How long is 12 hours in a day?

Is 12 hours a full day?

What time is it when its 12 hours?

How long is 24 hours a day?

How many hours are in a night?

Is a day 12 or 24 hours?

How many times a day is every 12 hours?

How many hours are in a whole day?

What are the hours in a day?

Is 12 am night or day?

Is midnight 12 am or PM?

How do you count 24 hours?

Why is there 60 seconds in a minute?

How long is a second?

What does 00 mean in time?

How much of a day is 12 hours?

How many times a day is every 12 hours?

Is 24 hours a whole day?

Is a day exactly 24 hours?

Hours to Days Conversion (hr to day) – Inch Calculator

Why is a day divided into 24 hours? (Intermediate) – Curious About Astronomy? Ask an Astronomer

12-hour clock – Wikipedia

12-hour clock – Wikipedia

Convert 12 hours to days – Time Calculator

12 hours in days | How long is 12 hours?

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