# What is the hour of 30 minutes?

Table of Contents

## What is the hour of 30 minutes?

Hence, one half of an hour is 30 minutes. Note: Instead of doing all such calculations, you can also solve this problem as we need to find what part of 1 hour is 30 minutes. We know that 1 hour is divided into 60 minutes and 30 minutes is half of 60 minutes so we can say that 30 minutes is half of 1 hour.

**When was the 24-hour day invented?**

Hipparchus, 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. Despite this suggestion, laypeople continued to use seasonally varying hours for many centuries.

**How does the military say midnight?**

Midnight In Military Time In the 24-hour format, midnight has two designations, 0000 and 2400 : If your day begins at midnight, you use 0000 in military time, pronounced “zero hundred hours.” If your day ends at midnight, you end your day at 2400 , pronounced “24 hundred hours.”

### What does the military call midnight?

Military Time: What You Need to Know Just like a 12-hour digital clock, military time is always displayed in four digits. The first two digits represent the hour and the last two digits represent the minutes. 0000 (said “zero-hundred”) is midnight, and 1200 (said “twelve-hundred”) is noon.

**Who invented 24 hours in a day?**

Hipparchus, 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.

**Why is there 24 hours in a day and not 25?**

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.

## 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 tall should a 3 year old be in feet?**

Preschooler weight and height chart

Age | Size | Boys |
---|---|---|

3 years | Weight | 31 lb 12oz (14.4 kg) |

Height | 3 ft 1.5 in (95.3 cm) | |

3.5 years | Weight | 33 lb 12 oz (15.3 kg) |

Height | 3 ft 3 in (99 cm) |