# Question: Why Do We Use The 24 Hour Clock?

## Is a day 12 or 24 hours?

The most common convention starts the civil day at midnight: this is near the time of the lower culmination of the Sun on the central meridian of the time zone.

Such a day may be referred to as a calendar day.

A day is commonly divided into 24 hours of 60 minutes, with each minute composed of 60 seconds..

## Why does 12 hour time exist?

Why do we use the a.m.-p.m. system for telling time? … The Egyptians used a 12-hour sundial to tell time during the daytime and a 12-hour water clock at night. The Romans also used a 12-hour clock. Early mechanical clocks showed all 24 hours, but over time, clockmakers found the 12-hour system simpler and cheaper.

## How long is 24hrs?

1 days24 hours equals 1 days.

## What time is 16 00 in military?

4:00 pmMethod 2 – Use This Chart To Convert 24 Hour Time12-hour am-pm clock24-hour military time4:00 pm16:005:00 pm17:006:00 pm18:007:00 pm19:0021 more rows

## Why don t Americans use the 24 hour clock?

It’s just a guess, but I think it’s because the traditional clock (the physical, analog clock) only has 12 numbers, hence, 0–12 a.m. and 0–12 p.m. It started with that, and it’s a tradition which remains in the US (as well as in some other places.) … In some countries, people use the 24-hour clock in spoken language.

## Who invented 24 hour time?

HipparchusHipparchus, whose work primarily took place between 147 and 127 B.C., proposed dividing the day into 24 equinoctial hours, based on the 12 hours of daylight and 12 hours of darkness observed on equinox days.

## What is 12 hour time called?

ante meridiemThe 12-hour clock is a way of dividing the 24 hours of the day into two sections. The two halves are called ante meridiem (a.m.) and post meridiem (p.m.). Both names are from Latin, and numbered from 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11….12-hour clock.24-hour clock12-hour clock00:0012:00 AM24 more rows

## Who uses 24 hour time and why?

The 24-hour time system has its origins in the Egyptian astronomical system of decans, and has been used for centuries by scientists, astronomers, navigators, and horologists. In East Asia, time notation was 24-hour before westernization in modern times.

## How do you explain 24 hour time?

There are two ways of telling the time:The 12-hour clock runs from 1am to 12 noon and then from 1pm to 12 midnight.The 24-hour clock uses the numbers 00:00 to 23:59 (midnight is 00:00).Children in Year 1 learn to tell the time on a 12-hour analogue clock which looks like this:More items…

## Is one day 12 hours or 24 hours?

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.

## What is 12am in 24 hour time?

24-Hour Time Formatam/pm24-hour9pm21:0010pm22:0011pm23:0012am24:0022 more rows

## Who uses a 24 hour clock?

Almost all countries use 24-hour clock. It’s particularly North America, UK, Egypt, India, the Philippines, Colombia, Saudi Arabia, and Australia where the 12-hour clock is the predominant form of stating the time. It is much easier to name which countries use AM and PM 12 hour clock, it is USA.

## What are the advantages of using a 24 hour clock?

We don’t need to select AM or PM option when it comes to our mobile phone or write AM or PM when we it comes to writing time. We always have to signify the digits which makes it more or less free from error to occur. It is also quick and easier to set alarms using 24 hour format once you get a knack of it.

## Do all countries use military time?

Nowadays, military time is used all over the world. The only difference is that the United States uses an original military time when the rest of the countries will use a standard 24-hour clock format, separating hours from minutes with a colon and sometimes skipping the leading zero.