The document discusses the causes of years, days, and months. It explains that: 1) The earth revolves around the sun in an elliptical orbit, taking 365 1/4 days, or approximately 365 days, to complete one revolution. 2) A day is caused by the earth rotating on its axis once every 24 hours, not by its orbit around the sun. 3) Months are caused by the moon orbiting the earth and appearing to change shape, or go through phases, every month as different portions of the moon are lit up by the sun facing the earth.

1. Topic: What is happening of year.
Made by : ALI MEHDI
SCI PROJECT

2. Objective:
 Students will able to learn what is mean by
happening of year.
 How cause the year are there.
 After the presentation students will able to
learn how year is preform.

3. What is cause of year
 People used to believe that the earth was the Centre of
the universe , and that the sun revolved around Earth.
Now, we knows that is not true.
 The Earth in fact revolves around the sun is an elliptical
(oval) path orbit.

4. How Much earth takes to spins around the sun
 The Earth takes 365 1 upon 4 and a half days(1 Earth year)to
make one revolution around the sun ,at speed of 110 000 km/h.
 When we convert it to speed so it is 110 km/h.

5. What is the cause of a day
1.In the past people used to think that the sun revolved around
Earth because of the apparent movement of the sun across the
sky.
2.The Earth orbits the sun once every 365 days and rotates about
its axis once every 24 hours.
3.Day and night are due to the Earth rotating on its axis, not its
orbiting around the sun.
4.The term 'one day' is determined by the time the Earth takes to
rotate once on its axis and includes both day time and night time.

6. What is the Cause of Month
 The moon is around, its appears to change its shape or
go through different phases every month.
 Half of the moon faces the Sun lit up by the Sun, The
other half moon faces away from the sun and is dark.
 The moon revolves around the Earth, only part of the
moon that is both lit up by the Sun facing the Earth can
be observed from the Sun.

7. Written task :
 How much Earth takes to revolute
around the Sun ?
 How much is the speed if we convert it
Earth ?