Heavy Work Exerting up to 100 pounds (45.4 kg) of force occasionally, and/or up to 50 pounds (22.7 kg) of force frequently, and/or in excess of 20 pounds (9.1 kg) of force constantly to move objects.
A calendar year is January to December. However, a school year is September to June, so a year does not always begin in January and end in December. A company's fiscal year is whatever they use for their financial beginning and end. It could be any month to the same time a year later.
Also, unlike a calendar year, a fiscal year can cover two calendar years, as it can start at any time during a calendar year and end 12 months later in the following calendar year. In starting period of civilization, globally it was agrarian economy which was mainly dependent on weather and monsoon.