Calendar

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/calendar

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. How long is Calendar?Approximately 365.2422 days
2. What is the gregorian calendar reform?Introduced in 1582 to correct inaccuracies in the Julian calendar
3. What is the time synchronization error?The Gregorian calendar has an error of about 26 seconds per year
4. What is a calendar and why do we use it?A calendar is a system that helps us keep track of days, months, and years, like a giant clock for the whole world. It lets us plan events, holidays, and work.
5. How did the ancient Egyptians make their calendar?The Egyptians made a 365‑day solar calendar that was based on the rising of the star Sirius, which matched the Nile's yearly flood.

Vernal Equinox: The point in Earth's orbit when day and night are of equal length, marking the start of spring.
Helical Rising: The first appearance of a star just before sunrise after a period of invisibility.
Intercalary Month: An extra month added to a calendar to keep it synchronized with astronomical or seasonal cycles.