• The Earth takes ... days, 5 hours and 48 minutes to orbit the
Sun. On ... March and 21st September, days and nights are the
same length - both 12 hours. This is called an equinox.
• Every ... years, the month of ... has 29 days instead of 28. This is
called a leap year.
• The Earth is divided into ... different time zones by imaginary lines
that go from pole to pole. Each time zone is one hour different
from its neighbours, with the Greenwich Meridian at the centre.
• The Earth is divided into two halves:
the northern and southern
hemispheres. The equator is the
imaginary line that separates the two
hemispheres. When it is summer in the ...,
it is winter in the ... .
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