UTC+0

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/utc0

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the geodetic datum?Established by the Prime Meridian, defined as 0 degrees longitude
2. What is the historical context?Evolved from Greenwich Mean Time (GMT), standardized in the late 19th century
3. Why is UTC+0 called Greenwich Mean Time?The Prime Meridian passes through the Royal Observatory in Greenwich, which was chosen in 1884 as the zero line for longitude. That location gave the name Greenwich Mean Time.
4. How did the Industrial Revolution influence UTC+0?Railways needed synchronized timetables, so a single standard time was created instead of each town using its own solar time. This helped keep trains on schedule.

Coordinated Universal Time (UTC): The primary international time standard, based on atomic time, kept within 0.9 seconds of mean solar time.
Leap Second: An occasional one-second adjustment added to UTC to keep it synchronized with astronomical time.