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Why Do We Have Leap Year?Even though the standard calendar year is 365 days, the Earth actually takes 365 days 5 hours 48 minutes and 46 seconds to go completely around the sun. (This is called a solar year.) In order to keep the calendar cycle synchronized with the seasons, one extra day is (usually) added every four years as February 29th. The Julian calendar (established by Julius Caesar in …
Why Do We Have Leap Year?Even though the standard calendar year is 365 days, the Earth actually takes 365 days 5 hours 48 minutes and 46 seconds to go completely around the sun. (This is called a solar year.) In order to keep the calendar cycle synchronized with the seasons, one extra day is (usually) added every four years as February 29th. The Julian calendar (established by Julius Caesar in …
Nearby words
solar cycle, solar day, solar eclipse, solar elastosis, solar energy, solar flare, solar furnace, solar ganglion, solar heating, solar house, solar mass
Origin of solar flare
First recorded in 1935–40
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for solar flare
solar flare
noun
a brief powerful eruption of particles and intense electromagnetic radiation from the sun's surface, associated with sunspots and causing disturbances to radio communication on earthSometimes shortened to: flare See also solar wind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Science definitions for solar flare
solar flare
A sudden eruption of hydrogen gas in the chromosphere of the Sun, usually associated with sunspots. Solar flares may last between several hours and several days, and have temperatures ranging from 20 to 100 million degrees K. The energy of a solar flare, which consists primarily of charged particles and x-rays, is comparable to tens of millions of hydrogen bombs, but is less than one-tenth the total energy emitted by the Sun every second. First observed in 1859, solar flares dramatically affect the Sun's weather and the solar wind, and are correlated with the appearance of auroras on the Earth. See also prominence.
The American Heritage® Science Dictionary
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