Moon, Earth’s sole natural satellite and nearest celestial body. Known since prehistoric times, it is the brightest object in the sky after the Sun. Its name in English, like that of Earth, is of Germanic and Old English derivation.
As the stars appear to move westward because of Earth’s daily rotation and its annual motion about the Sun, so the Moon slowly moves eastward, rising later each day and passing through its phases: new, first quarter, full, last quarter, and new again each month. The long-running Chinese...
Earth is intimately tied to the star around which it revolves, the Sun, and the satellite that revolves around Earth itself, the Moon. Without the Sun, of course, life on Earth simply could not exist, not just because of the need for light but to an even greater degree because of the ...
Most of the time, the full moon isn't perfectly full. We always see the same side of the moon, but part of it is in shadow, due to themoon's rotation. Only when the moon, Earth and the sun are perfectly aligned is the moon 100% full. And sometimes — once in ablue moon— the...
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The Earth's axis of rotation is tilted about 23.5 degrees in relation to the ecliptic plane, an imaginary disk through Earth's orbit around the sun. This means the Northern and Southern hemispheres point somewhat toward or away from the sun depending on the time of year, varying the amount...
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1.(Astronomy) (sometimes capital) the natural satellite of the earth. Diameter: 3476 km; mass: 7.35 × 1022kg; mean distance from earth: 384 400 km; periods of rotation and revolution: 27.32 days. 2.(Astronomy) the face of the moon as it is seen during its revolution around the earth...
and the sun (2) are rotatably connected on the pedestal (1); under the effect of the transmission mechanism, the earth (3) orbits around the sun (2) and simultaneously rotates, and the moon (4) orbits around the earth (3); the transmission mechanism is a gear set; an rotation axis...
The Earth Earth rotates on its tilted axis Each rotation of the Earth is a day The Earth completes a revolution around the sun Each revolution around the sun is a year The Earth (2) Earth’s tilted axis causes the seasons Earth’s travel around the sun changes the sunlight in each hemis...