Day and Night

Day and Night

We live on the Earth

• During the day, we see the sun

• During night, we see the moon and the stars

The sun, the moon and the stars, are all objects in space

• Astronomers are scientists that study objects in space

Open Ended

What is a scientist who studies objects in space called?

The pattern of a day

• Everyday the sun rises in the east.

• It travels across the sky and sets in the west.

• It is highest in the sky at mid-day.

How can we explain this pattern?

• Let's look at possible ideas that could explain our observations of how the sun moves across the sky

Multiple Select

Which diagrams and statements are true?

• The Earth sits still in space. The Sun travels around the Earth once a day

• The Earth is not still, it turns on its axis once a day. This makes the sun appear to travel around the sun

The pattern of a day

• The Earth's axis is the line joining the north pole to the south pole

• As of there were a stick going straight through the Earth from top to bottom

• The Sun appears to travel from east to west. This tells us that the Earth must be turning the other way, from west to east

Around the world

• At any moment, only one half of the Earth is in sunlight. As the Earth turns, this part will move into darkness, away from the sun, and the parts of the Earth that were in darkness, will move to face the sun.

• Look at the diagram. Name one country where it is day and one where it is night

Multiple Choice

Look at the diagram. Is it sunrise, or sunset in India?

• sunrise

• sunset

Revolve

• To revolve means to travel around.

• Earth revolves around the sun.

• One trip around the sun takes one year.

Multiple Choice

Earth revolves around _____.

• its axis

• the Sun

Multiple Choice

Earth _____ around the Sun.

• Revolves

• Rotates

Rotation

• To rotate means to spin.

• Earth rotates on its axis.

• A rotation takes one day.

Multiple Choice

What does rotate mean?

• Travel

• Spin

Multiple Choice

The earth axis is....

• a short line

• a wavy line

• an imaginary line

Multiple Choice

A rotation takes one ____.

• Year

• Month

• Day

Multiple Choice

The axis goes from the ..... at the top.

• Sun

• North Pole

• South Pole

Multiple Choice

The axis continues through the centre of the Earth to the ..... at the bottom.

• globe

• direction

• south pole

Multiple Choice

When Earth faces away from the Sun, it is _____.

• Day Time

• Night Time

Multiple Choice

When Earth faces towards the Sun, it is _____.

• Day Time

• Night Time

Multiple Choice

In Asia, it is ____.

• Day Time

• Night Time

Multiple Choice

In North America, it is ____.

• Day Time

• Night Time

Multiple Choice

The earth takes ..... day to rotate (spin) on its axis.

• 365

• 24

• 1

Multiple Choice

What is the Science word for spin?

• Revolve

• Rotate