Reading Comprehension
Activity
Read the article and answer the questions below.
Ice-age hunters in Europe
over 20,000 years ago apparently scratched lines or made holes in sticks and bones. Historical accounts state that Sumerians,
5000 years ago, had a calendar with 30 day months. Stonehenge, built over
4000 years ago in England, had alignments which determined eclipses,
solstices and so on. To name just a few examples. Archeologists usually discover that in every culture,
some people were preoccupied with measuring and recording the passage of
time.
The Egyptians, for one,
realized that the "Dog Star" or Sirius, rose next to the sun every
365 days, about when the annual inundation of the Nile began. Based on this
knowledge, they devised a 365 day calendar that seems to have begun around 3100
BCE.
Before 2000 BCE, the
Babylonians used a year of 12 lunar months, giving a 354 day year. In
contrast, the Mayans of Central America relied not only on the Sun and Moon,
but also the planet Venus, to establish 260 day and 365 day calendars.
The solar calendar used by most of the world today is known as the
Gregorian calendar. Named after Pope Gregory XIII, who introduced it in 1582,
this modern calendar is the end result of hundreds of years of fine-tuning.
It was developed from the Julian calendar, which was created in 46 BC by
Julius Caesar.
The Julian calendar was also a solar calendar, based on the time it
takes for Earth to travel one complete loop around the sun. In Julius Caesar’s
time, although astronomers believed that the sun revolved around Earth, they
still managed to make fairly accurate measurements of the length of a
complete cycle. A solar year, they calculated, was about 365.25 days long. Julius Caesar, deciding that it would be difficult to add ¼ of a day
onto each year, ordered one extra day to be added every four years to the month
of February, creating what would be called “leap” years. This calendar
was used by the western world for over a thousand years.
Unfortunately, there was a problem with the Julian calendar. When
Julius Caesar ordered a leap year every four years, he was putting in too
many extra days. A solar year is not 365.25 days long, but in fact 365.24219
days. The difference between the actual length of the solar year and the
approximated value is very small, but over several hundred years it began to add
up. By the 1500s, spring holidays were starting to happen in the summer.
In 1582, Pope Gregory XIII came up with an idea of how to fix the
problem. He realized that there were too many leap years in the Julian calendar,
so hereorganized it into a more complicated system. In the new calendar,
there is still a leap year almost every four years, but there is also a new
rule. If the year ends in 00, it is only a leap year if the year’s number can be divided
by 400. For this reason, 1800 and 1900 were not leap years, but 2000 was.
The new calendar was so accurate that over the next several hundred
years, it was adopted by almost every country in the world. Over 400 years after
its introduction, the Gregorian calendar is currently in use world-wide.
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Some text
and images adapted from : www.nist.gov
1.Which early civilization had a month of 30 days?
a.The Babylonians b.The
Sumerians c The Egyptians
2.Which early civilization also had a year with 365 days?
a.The Mayans b.The
Babylonians c The Egyptians
3. Which is the name of the calendar currently most used around the
world?
a. the Gregorian calendar b. the
Julian calendar c. the Lunar calendar
4. How many days are there in a solar year?
a. 365 b. 365.25 c. 365.24219
5. When were leap years first used?
a. 46 BC b. 1592 c. 1700
6. Which best describes the kind of calendar used today around the world?
a. a solar calendar, based on the revolution of the moon around Earth
b. a lunar calendar, based on the revolution of the moon around Earth
c. a solar calendar, based on the revolution of Earth around the sun
7. By our modern calendar, which of the following years WILL be a leap
year?
a. 2100 b. 2500 c. 2800
8. Which of the following best describes the reason for creating leap
years?
a. The Earth revolves around the sun.
b. The solar year does not divide into an even number of days, and it
would be difficult to add ¼ of a day onto each year.
c. Astronomers calculated the approximate length of a solar year.
9. Which statement best describes the problem with the Julian calendar?
a. Pope Gregory XIII did not like the Julian calendar.
b. The actual solar year was slightly shorter than the year calculated
for the Julian calendar, so there were too many leap years.
c. The actual solar year was slightly longer than the year calculated
for
the Julian calendar, so there were not enough leap years.
