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How many years have gone past since the first evidence of life appeared on Earth?
3,500,000,000
Large blocks of time are called...
eras
10 years make a ...
decade
A millennium is...
1000 years
This era comes after Ancient History.
Middle years
Calendars based on the time it would take for the moon to go around the Earth are called...
lunar calendars
In the Julian calendar, the years started counting from the...
founding of Rome
In both the Julian and Gregorian calendars, in every four years the calendar would add an extra day. This year is called...
a leap year!
What was the problem with the Julian calendar?
The seasons and the calendar did not match!
Which calendar do we use today?
the Gregorian calendar
What is a solar calendar?
Solar calendar is the calendar that is formed based on the time it takes the Earth to revolve once around the Sun.
integral part means...
essential, fundamental
