 SkyTellers Day and Night activities for young children About Day and NightWhy Does Earth Have Day and Night?
Do other planets have day and night? Something to ponder: Does Pluto even have a “day” and “night” like we think of on Earth? Pluto is so distant from the center of our solar system that our Sun would look like a very bright star in its sky! Why does Earth's day length change during the year? Earth rotates on its axis; this causes us to experience day and night. But Earth's axis is tilted 23.5 degrees (the angle is measured between Earth's equatorial plane and the plane in which it orbits our Sun). As Earth orbits our Sun, the axis points toward the same location in space — almost directly toward Polaris, the North Star. This means that during Earth's movement around our Sun each year, our polar regions spend loooooooong periods pointed toward our Sun in the summer (for example, July in the northern hemisphere, or December in the southern hemisphere) and long periods pointed away from our Sun during the winter. At latitudes greater than 66.5 degrees (90 degrees minus 23.5 degrees, the tilt of the axis), the regions above the Arctic and Antarctic circles on our globe, days of constant darkness or light occur.
Tilted Earth at summer, spring, fall, and winter positions around the Sun, Because of this tilt and Earth's movement around our Sun, there is a time when Earth's north pole is tilting 23.5 degrees toward our Sun. This is the summer solstice, the first day of the northern hemisphere summer and the longest day of the year in the northern hemisphere. On December 21 or 22, Earth's north pole is tilting 23.5 degrees away from our Sun and the south pole is tilted toward our Sun. This is the winter solstice, the shortest day of the year in the northern hemisphere. Twice each year — during the equinoxes (“equal nights”) — Earth's axis is not pointed toward our Sun. The spring equinox in March marks the beginning of the transition from 24 hours of darkness to 24 hours of daylight at the north pole. The fall equinox in September marks the shift into 24 hours of darkness at the north pole. During the equinoxes every location on Earth (excluding the extreme poles) experiences a 12-hour day length. Other planets also experience these changes in day and night length because they too are tilted on their axes. Each planet's axis is tilted at a different angle. Jupiter is tilted only 3 degrees, so its change in day and night length as it moves around the Sun is less extreme than that of Earth. Neptune's axis is tilted 30 degrees, so day and night changes would be more extreme on Neptune than on Earth. Uranus presents an interesting case because its axial tilt is even more extreme — 98 degrees! This means that the north pole of Uranus is pointed at the Sun during the north polar summer; the south pole is in total darkness. During the north polar winter, some 42 Earth years later, the south polar axis points at the Sun and the north polar region is in total darkness. During the spring and fall, when its axis is perpendicular to the incoming rays of the Sun, Uranus experiences a 17-hour day and night cycle as it spins on its axis. Good news for overachievers: Earth's days are getting longer!
What causes Earth's change of seasons? Possible Answers:
Parts of Earth are tilted towards or away from the sun as it revolves
Earth is closer to the sun for part of its revolution
One half of Earth is facing the sun as it rotates
Parts of Earth are closer to the sun as it rotates
Correct answer: Parts of Earth are tilted towards or away from the sun as it revolves Explanation: The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun).
Which of the following is primarily responsible for Earth's seasons? Possible Answers:
Correct answer: rotation and tilt Explanation: The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun).
What is best represented by the diagram shown? Possible Answers:
Correct answer: Earth's seasons Explanation: The answer is "Earth's seasons." The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun).
What is the summer solstice? Possible Answers:
when the North Pole is tilted furthest from the sun
the shortest day of the year
Correct answer: none of these Explanation: The answer is none of these. The answer choices describe the winter solstice. The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
When is the north pole tilted closest to the sun? Possible Answers:
Correct answer: summer solstice Explanation: The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
In which position would the southern hemisphere experience winter? Possible Answers:
Correct answer: position 2 Explanation: The answer is "position 2" because the sun's rays are indirectly hitting the surface in the southern hemisphere. Positions 1 and 3 are fall and spring in the southern hemisphere respectively. The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
In which position is the northern hemisphere experiencing winter? Possible Answers:
Correct answer: position 4 Explanation: The answer is "position 4" because the sun's rays are indirectly hitting the surface in the southern hemisphere. Positions 1 and 3 are spring and fall in the northern hemisphere. The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
Which explanation best describes why there are less than 10 hours of daylight in Alaska during the month of April? Possible Answers:
Alaska is located in the far southern hemisphere, away from the sun in spring, and day and night are caused by Earth's revolution.
Alaska is located in the far northern hemisphere, away from the sun in spring, and day and night are caused by Earth's rotation.
Alaska is located in the far southern hemisphere, away from the sun in spring, and day and night are caused by Earth's rotation.
Alaska is located in the far northern hemisphere, away from the sun in winter, and day and night are caused by Earth's revolution.
Correct answer: Alaska is located in the far northern hemisphere, away from the sun in spring, and day and night are caused by Earth's rotation. Explanation: The answer is "Alaska is located in the far northern hemisphere, away from the sun in spring, and day and night are caused by Earth's rotation." The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
How long would each season be if Earth did NOT spin on its axis? Possible Answers:
Earth's rotation causes day and night, not the seasons.
Correct answer: Earth's rotation causes day and night, not the seasons. Explanation: The answer is "Earth's rotation causes day and night, not the seasons." The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
Which answer choice best explains the cause of summer in the southern hemisphere? Possible Answers:
The southern hemisphere receives more direct sunlight in the summer.
The north pole is tilted away from the sun in the summer.
The sun is closer to the Earth during the summer.
Earth's southern axis is tilted towards the sun during the summer in the northern hemisphere.
Correct answer: The southern hemisphere receives more direct sunlight in the summer. Explanation: The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. It is also the day that the Sun reaches its highest point in the sky. The winter solstice, or the shortest day of the year, happens when the Earth's North Pole is tilted farthest from the Sun.
Jude
Northwest College, Associate in Arts, Education of Individuals in Elementary Special Education Programs. University of Wyomin...
Raymond
Rider University, Bachelor in Arts, Spanish Teacher Education.
Marlo
Rowan University, Bachelor of Science, Prelaw Studies. Rowan University, Master of Arts, Criminal Justice.
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Which answer choice best explains the change from daytime to nighttime on earth?
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