Spring starts in the month of March. Astronomically, spring begins at the precise point in time when the center of the sun passes directly over the Equator. This moment is called the vernal equinox.Know More
Use of the Gregorian calendar keeps the arrival of spring on March 20 or March 21 for most years, though sometimes spring arrives on March 19.
According to National Geographic, in addition to the astronomical start of spring, a biological spring begins each year, usually on a different date. Climate change researchers note that in some areas, biological signs of the arrival of spring, such as flowers blooming and snow melting, begin weeks earlier in 2014 than it did in the 1970s.Learn more about Months & Seasons
If the month has 30 days, then it is equal toÂ 2,592,000 seconds. However, in a calendar year,Â there also are months that have 31 orÂ 28 days. If the month has 31 days, then there are 2,678,400 seconds in thatÂ month.Full Answer >
Months have different numbers of days because a month is a measure of time that corresponds or nearly corresponds to the length of time the Moon revolves once around Earth. The lengths of all astronomical months vary slightly due to perturbations in the Moon’s orbit.Full Answer >
The term "semi-monthly" means twice per month. Semi-monthly is an adjective that can sometimes be confused with the term "bi-weekly," which in some circumstances can result in the same frequency as semi-monthly.Full Answer >
In the Northern Hemisphere, autumn is between the autumnal equinox that begins on Sept. 22 or 23 and the winter solstice, which is Dec. 21 or 22. In the Southern Hemisphere, autumn is between March 20 or 21 and June 21 or 22.Full Answer >