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30. Form and Size of the Earth.

The line on the earth where earth and
sky seem to meet is called ‘the horizon.
The horizon
surrounds us on
every side. —

Were you
hilltop ?
did you see the
same horizon
that you could
see from the
lower land?

Which picture
shows vessels
going to sea?

You can look over the masts of one vessel,
and see the water beyond. Another is sailing

 

 

Soap Bubbles.

1 This line is often called the skyline, and the name
horizon is applied to the circular skyline, as seen on the
ocean.

ever on a high.
If so,

out of sight.
Only the sails
can be seen.
The hull is
below the
horizon.

Can yousee
the smoke of
the steamer -
that is below
the horizon ?
If the earth
were flat,
could vessels go out of sight in this way?

Here is a map of the moon.

Find the long ridge just below the middle of
the moon. This ridge isa mountain range. It
is so long that it would take a swift train of cars
all day to run from one end of it to the other.

Have you ever blown soap bubbles? How
pretty the little globes look as they float away.
When the moon is pale and round, does it look
like a great bubble ?

If we were far off in the sky,
the earth would appear like a

 

Map of the Moon.

 

 

 

 

 

 

great moon.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The moon is a very large ball,

 

 

 

 

but the earth is many times larger.

 

 

 

 

 

 

Ships on the Horizon.

 

We see so small a part of the
earth at a time that it does not
look round like a ball.

What is the form of the earth
in the picture on the first page?»

The greatest distance round the
earth is about 25,000 miles. The
greatest distance through it is
about 8,000 miles.