Sunspot-cycle
noun, Astronomy.
1.
the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
Read Also:
- Sunspot-number
noun, Astronomy. 1. Wolf number. noun, Astronomy. 1. a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots.
- Sunspots
noun 1. one of the relatively dark patches that appear periodically on the surface of the sun and affect terrestrial magnetism and certain other terrestrial phenomena. noun 1. any of the dark cool patches, with a diameter of up to several thousand kilometres, that appear on the surface of the sun and last about a […]
- Sun-star
noun 1. any starfish of the genus Solaster, inhabiting cold and temperate waters off both U.S. coasts.
- Sunstone
noun 1. a reddish variety of oligoclase feldspar, used as a gem, having a red and bright-yellow play of color. noun 1. another name for aventurine (sense 2)
- Sun-stools
Unflattering hackerism for SunTools, a pre-X windowing environment notorious in its day for size, slowness, and misfeatures. X, however, is larger and slower; see second-system effect.