# Quick Answer: How Is 24 Hours Calculated?

## How do you calculate 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)..

## How long is 24 hours in a day?

86,400 secondsBesides the day of 24 hours (86,400 seconds), the word day is used for several different spans of time based on the rotation of the Earth around its axis. An important one is the solar day, defined as the time it takes for the Sun to return to its culmination point (its highest point in the sky).

## Who decided on 24 hours in a day?

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.

## Who invented time?

The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today’s clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight.

## How many hours is 830 5?

8:30am to 5:00pm is a span of 8 and 1/2 hours. A work day which includes a 1/2 hour unpaid break at midday for lunch typically has those hours. Don’t forget to take a lunch break! 8:00 am to 5:30 pm would be an hour longer .. but everybody noticed my typo and did that math in their heads..

## What is the time 100 hours after 7am?

ANSWER: 11a. Since it’s 11 hours, It means that the time is 11am.

## 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.

## Is am the morning or night?

Anything AM can be referred to as morning, and anything PM as night. Generally these will be broken into morning (AM), afternoon (PM), evening (PM) and night (PM). People sometimes confuse the earlier AMs because it’s still dark outside, but 2 AM is 2 in the morning, not night.

## Is 24 hours a whole day?

Modern timekeeping defines a day as the sum of 24 hours – but that is not quite correct. The Earth’s rotation slows down over time. So in terms of solar time, most days are a little longer than 24 hours.

## Is 9am to 9am 24 hours?

24-Hour Time Formatam/pm24-hour7am07:008am08:009am09:0010am10:0022 more rows

## What time is 11 59 pm?

11:59 PM or 12:01 AM, or. 23:59 or 00:01 (24-Hour Clock)

## Why is a day 23 hours and 56 minutes?

If our definition of a day was truly based on one complete rotation of the Earth on its axis — a 360 degree spin — then a day would be 23 hours, 56 minutes, and 4 seconds. … The mismatch of nearly 4 minutes is because the Earth must rotate more than 360 degrees between one dawn and the next.

## How many minutes is 6 hours?

Hours to Minutes Conversion TableHoursMinutes3 Hours180 Minutes4 Hours240 Minutes5 Hours300 Minutes6 Hours360 Minutes20 more rows

## How long is 24hrs?

1 days24 hours equals 1 days. Convert 24 hours into minutes, seconds, years, months, weeks, miliseconds, microseconds, nanoseconds, etc…

## How many hours exactly is a day?

23 hoursAnother way to measure a day is to count the amount of time it takes for a planet to completely spin around and make one full rotation. This is called a sidereal day. On Earth, a sidereal day is almost exactly 23 hours and 56 minutes.