What Causes Day and Night? - Universe Today
Understand the rotation of the Earth in relation to the Sun. Use the idea of the Earth's rotation to understand day and night and the apparent be part of a larger set of activities that is used to explain the tilt of the rotation axis and the seasons. The change between day and night is caused by the rotation of the Earth on its axis. If the Earth did not rotate as it does, the day/night cycle. Namely, what causes the cycle of day and night, and why don't all Earth's axial tilt and its relation to the rotation axis and plane of orbit as.
The changing lengths of days and nights depends on where you are on Earth and the time of year.
Also, daylight hours are affected by the tilt of the Earth's axis and its path around the sun. Length of a Rotation A solar day, 24 hours, is the time it takes for the Earth to rotate exactly once so that the sun appears at the same place in the sky the next day.
How does the rotation of the Earth cause day and night?
However, the Earth is also moving around the sun, and this movement makes measuring the day somewhat complicated. The actual time of one Earth rotation is a little shorter — about 23 hours and 56 minutes. Astronomers discovered this by observing the time it took for a star to appear in the same place in the sky the following day, and they called this a sidereal day. Longer and Shorter Days Although a solar day is 24 hours, not every day has 12 hours of daylight and 12 hours of night.
Movements of the Sun, Moon & Earth | Sciencing
Daytime is shorter in winter than in summer. As the Earth moves around the sun during a year, the northern half of the Earth is tilted towards the sun in the summer, making daytime longer than night.
In winter, this reverses; the earth tilts away from the sun and nighttime becomes longer. In the spring and fall, the tilt is neither toward or away from the sun but somewhere between, so day and night are more the same at these times of the year.
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. Nussbaum The views held by students about the shape of the Earth are varied and often unique to the individual.
Day and night
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. Contrasting student and scientific views Diagram 1: The view is that the Earth is a circular disc floating in the atmosphere. The view that the air and Earth form equal hemispheres and the observer is located centrally.
Nussbaum Students hold a range of views which they use to explain day and night: NussbaumSkamp 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.
The Earth orbits the sun once every 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. 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.