Extremely slow downslope movement of soil. Caused by combination of factors which allow horizontal dislodging of particles which then subside under gravity. Factors include ...
In static visual arts, the perceptual effect or illusion of movement, effected by the elements of an image that lure the eye to perceive change. The way the eye views an image can ...
One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's ...
Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are ...
1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith.
2) Directional ...
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