Algebra. 1  an exponent. 2  the integer n in a radical defining the n- th root: â is a radical having index three. 3  a subscript or superscript indicating the position of an object in a series of similar objects, as the subscripts 1, 2, and 3 in the series x 1 , x 2 , x 3 4  . winding number.
By the meteorological calendar, spring starts on 1 March. The seasons are defined as Spring (March, April, May), Summer (June, July, August), Autumn (September, October, November) and Winter (December, January, February).
Earliest spring since 1896! The 2016 vernal or spring (or fall) equinox comes on March 20 at 4:30 UTC (March 19 at 11:30 p.m. CDT). The March equinox signals the beginning of spring in the Northern Hemisphere â earliest spring since 1896 â and autumn in the Southern Hemisphere. It marks that special moment when the sun crosses the celestial equator going from south to north. In 2016, this equinox arrives on March 20 at 4:30 UTC, or on March 19 at 11:30 p.m. Central Daylight Time. Hereâs what we in the Northern Hemisphere know about this equinox. Our sunrise is earlier now, and nightfall comes later. Plants are sprouting.