Solar cycles average about 11 years each. The eleven year cycle is measured by changes in the Sun's output, ejection of solar materials, sunspots, and auroras on Earth. Sometimes the cycle is referred to as a 22-year one since the sunspot activity reverses solar hemispheres (changes polarity) in alternating cycles.
Solar flares and prominences occur in 11-year cycles because of the Sun's magnetic field. This is known as the solar cycle, which is caused by the changing magnetic properties of the Sun. The cycle is driven by the Sun's internal dynamo mechanism, with peaks and valleys in solar activity occurring roughly every 11 years.
Mercury
For the same reason you wouldn't use a ruler to measure a paramecium. A lightyear is the distance that light travels in a year, about 6,000,000,000,000 miles. The reason it isn't used inside of our solar system is, simply, because the solar system isn't that big.
A system of organizing time that defines the beginning, length, and division of a year is known as a calendar. Calendars can vary in structure, typically consisting of months and days, and they may be based on lunar, solar, or lunisolar cycles. The Gregorian calendar, widely used today, is a solar calendar that divides the year into 12 months, with a total of 365 days, or 366 in a leap year. Other calendars, like the Islamic or Hebrew calendars, follow different systems and cultural traditions.
In 2012 the solar system will be exactly the same. Because 2012 is just another year there's no such thing as the end of the world
sunspots
Solar activity, such as sunspots and solar flares, follows an 11-year cycle known as the solar cycle. This cycle is driven by changes in the sun's magnetic field and can affect space weather and geomagnetic activity on Earth.
sunspots
Sunspot cycles are 10 to 12 years in length.
Changes in Earth's orbit and axial tilt, known as Milankovitch cycles, are responsible for triggering the repeating 100,000-year cycles of ice ages. These variations affect the amount of solar radiation reaching Earth's surface, leading to periods of glaciation and interglacial periods.
1950's solar system invented
Solar flares and prominences occur in 11-year cycles because of the Sun's magnetic field. This is known as the solar cycle, which is caused by the changing magnetic properties of the Sun. The cycle is driven by the Sun's internal dynamo mechanism, with peaks and valleys in solar activity occurring roughly every 11 years.
As soon as there was a solar system.
That changes every year, since the Moon's cycles are not synchronized with the year.
The Egyptian calendar was base on a solar year
non-examples of solar system iz galaxies,stars,and light-year
Both the American and Chinese calendars are based on a solar system, with the American calendar following the Gregorian system and the Chinese calendar following the lunisolar system. They both have 12 months in a year, but the Chinese calendar has a leap month added every few years to make up for the discrepancy between lunar and solar cycles.