NSES Content Standard D
Earth and Space Science: Earth in the Solar System Grades 5-8, page 160 Most objects in the solar system are in regular and predictable motion.
Those motions explain such phenomena as the day, the year, phases of the
moon, and eclipses.
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Benchmark 4A The Physical Setting: The
Universe
Grades 6-8, page 64
Nine planets of very different size, composition, and surface features
move around the sun in nearly circular orbits. Some planets have a great
variety of moons and even flat rings of rock and ice particles orbiting
around them. Some of these planets and moons show evidence of geologic
activity. The earth is orbited by one moon, many artificial satellites,
and debris.
Benchmark 4B The Physical Setting: The
Earth
Grades 3-5, page 68
Like all planets and stars, the earth is approximately spherical in
shape. The rotation of the earth on its axis every 24 hours produces the
night-and-day cycle. To people on earth, this turning of the planet makes
it seem as though the sun, moon, planets, and stars are orbiting the earth
once a day.
Benchmark 4B The Physical Setting: The
Earth
Grades 6-8, page 69
The moon's orbit around the earth once in about 28 days changes what
part of the moon is lighted by the sun and how much of that part can be
seen from the earth--the phases of the moon.