All of these can desynchronize our social activity from our biological time. Modern society requires synchronization in such things as school start times, work times and television watching times. The conflict is that the primordial cycle of light and dark from the sun is deeply embedded within our evolutionary past as coded in our DNA we have a вЂњbuilt-inвЂќ biological time for body temperature, hormone levels, sleep, and much more, that cycles very close to 24 hours. Instead, we use electric light to synchronize most of our societal activities regardless of where the sun is at in its course through the heavens. The idea is that given the constraints of modern life, most people are out of sync with their natural circadian rhythms, which should follow the sun. They were interested in something called вЂњ social jet lag.вЂќ Writing in the Journal of Health Economics, authors Osea Giuntella of the University of Pittsburgh and Fabrizio Mazzonna of UniversitГ della Svizzera Italiana took an innovative slant on the effect of position in a time zone on health and economics. However, a buzzkill new study has just reported health problems with a later clock time of sunset as well, and itвЂ™s not just breast cancer.Д®arly start times for school and work can not only cause sleepiness but may also contribute to disease, studies suggest. ThatвЂ™s been part of the campaign for a permanent daylight saving time вЂ“ an hour more fun in the sun in the evening under DST. However, the good part to living in the west is that there is an hour more daylight after work in Amarillo than in Nashville. The authors of these two studies suggest it is the chronic disruption of circadian rhythms from getting up in the dark that may be the culprit.

As I reported previously, two studies have shown that breast cancer risk is higher in the western parts of time zones the first was conducted in European Russia and the second in the U.S. This means that many people in Amarillo must get up before sunrise to get to work on time compared to people in Nashville, who can get up after sunrise.

Similarly, if sunset in Nashville is 8 p.m., itвЂ™s about 9 p.m. If sunrise in Nashville, Tennessee is 6:30 a.m., itвЂ™s about 7:30 a.m. The sun both rises and sets later in the western parts of time zones, by about an hour at the extremes.

United states time zones