Shadow and Class Color did happen in the past, future, or present????

Today I had another shadow.  It was a little bit awkward since it was class color day and everyone was acting crazy.  In class we talked about timezones.  Timezones are regions of a globe that observe a uniform standard time.  They tend to follow the boundaries of countries and there subdivision.
-Earth as a sphere is divided into 360 degrees of longitude.
-Divide 360 degrees by twenty-four time zones equal fifteen.
-Each fifteen degree band of longitude is assigned to a standard time zone.
-GMT (Greenwich Mean Time) is located at the prime meridian (which is 0 degrees longitude)
How time was invented:

Scottish-born Canadian Sir Sandford Fleming proposed a worldwide system of time zones in 1879. He advocated his system at several international conferences, and is thus credited with the instigation of "the initial effort that led to the adoption of the present time meridians." In 1876, his first proposal was for a global 24-hour clock, conceptually located at the center of the Earth and not linked to any surface meridian. In 1879 he specified that his universal day would begin at the anti-meridian of Greenwich (180th meridian), while conceding that hourly time zones might have some limited local use. He also proposed his system at the International Meridian Conference in October 1884, but it did not adopt his time zones because they were not within its purview. The conference did adopt a universal day of 24 hours beginning at Greenwich midnight, but specified that it "shall not interfere with the use of local or standard time where desirable".

By about 1900, almost all time on Earth was in the form of standard time zones, only some of which used an hourly offset from GMT. Many applied the time at a local astronomical observatory to an entire country, without any reference to GMT. It took many decades before all time on Earth was in the form of time zones referred to some "standard offset" from GMT/UTC. By 1929, most major countries had adopted hourly time zones. Nepal was the last country to adopt a standard offset, shifting slightly to UTC+5:45 in 1986.

Today, all nations use standard time zones for secular purposes, but they do not all apply the concept as originally conceived. North Korea, Newfoundland, India, Iran, Afghanistan, Burma, Sri Lanka, the Marquesas, as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands of New Zealand, use quarter-hour deviations. Some countries, such as China and India, use a single time zone even though the extent of their territory far exceeds 15° of longitude.