State the reason: Day nad night occurence is long and short
Answers
Answer:
We get day and night because the Earth spins (or rotates) on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. It takes 24 hours for the world to turn all the way around, and we call this a day.
Answer:
We get day and night because the Earth spins (or rotates) on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. It takes 24 hours for the world to turn all the way around, and we call this a day.
Explanation:
Contrasting student and scientific views
Student everyday experiences
A student is looking through a telescope at the daytime sky.Understandably, students have a strong tendency to interpret reality only according to the way it is perceived from their own perspective. This has implications for their understandings of ideas that represent objects on a very large scale like the solar system. They observe the world from their own place on a very small region of the Earth. They often find it difficult to comprehend distances in the order of their own country and consequently larger distances like those involved with the solar system are often unimaginable for them. In addition, students observe motion from their own point of reference. In order to understand the motion of the sun and Earth they must imagine a different point of reference. This can make ideas in this area very challenging for students to grasp.
Research: Nussbaum (1985)
The views held by students about the shape of the Earth are varied and often unique to the individual. Even though students can often articulate that the Earth is a sphere, upon further investigation they often believe in fact that the Earth is how they perceive it, flat. Some children view the Earth as round or circular as opposed to spherical (see diagram 1 below). Another common view is of the Earth as flat and that it and the air form a sphere (see diagram 2 below). Students can often represent the Earth as a sphere (or circle on the plane of the paper) but they still perceive the person on the top of the sphere as the upright person (see diagram 3 below).
Diagram 1:
The view is that the Earth is a circular disc floating in the atmosphere. A person standing on a flat horizontal circular disk.
Diagram 2:
The view that the air and Earth form equal hemispheres and the observer is located centrally. A person standing on a hemisphere representing the ground.
Diagram 3:
The view is that observers are located around the surface of the Earth but ‘down’ is not towards the centre of the Earth, but towards the bottom of the page.
Note: the girl’s hair still hangs ‘down’. 2 people standing on either end of a spherical earth.
Research: Nussbaum (1985)
Students hold a range of views which they use to explain day and night:
the sun shines during the day and the moon shines at night
the sun and the moon are on different sides of the Earth and the Earth rotates facing one and then the other
the sun goes around the Earth
the sun moves to cause day and night
a day is the time it takes the Earth to move around the sun
a day is the time it takes for the sun to move around the Earth
night occurs when the moon covers the sun
night occurs when clouds cover the sun.
Research: Nussbaum (1985), Skamp (2004)
These views are also evident in and related to the focus idea Forces without contact.
Scientific view
The Earth is one of several planets that orbit the sun, and the moon orbits the Earth. The Earth is essentially a sphere and the sun is a nearby star which is an unimaginably large ball of gas that radiates light and heat as products of nuclear reactions.
Side of the spherical earth illuminated by the sun.The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not its orbiting around the sun. 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.
Critical teaching ideas
The Earth is a sphere and the sun is a star and produces light.
The Earth and sun are part of the solar system, with the sun at its centre.
An Earth day is 24 hours because the Earth spins on its axis once every 24 hours.
At any one time half of the Earth’s sphere is in sunlight (day) while the other half is in darkness (night).
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