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The Earth–Sun Relationship
Published in Matt Fajkus, Dason Whitsett, Architectural Science and the Sun, 2018
Many localities adjust clocks to daylight saving time (DST), where clocks are set one hour ahead in summer in an effort to take advantage of energy savings as the result of longer daylight hours. In the United States, all states except Hawaii and most of Arizona observe daylight saving time, but most U.S. territories do not. The European Union and quite a few other countries use daylight saving time as well, but many do not. As a general rule, countries in or near the tropics do not employ daylight saving time because day lengths do not change significantly enough during the year to make a substantial impact on energy use. Outside the tropics, countries are more likely to adopt daylight saving time.
Solar Radiation
Published in T. Agami Reddy, Jan F. Kreider, Peter S. Curtiss, Ari Rabl, Heating and Cooling of Buildings, 2016
T. Agami Reddy, Jan F. Kreider, Peter S. Curtiss, Ari Rabl
All solar angle calculations should use solar time. Solar time is based on the apparent motion of the sun as seen from a point on the surface of the earth. Universal time, or Greenwich civil time tciv,Gre, is the time along the Greenwich meridian (or longitude), adopted as the reference meridian of zero longitude. This is the time quoted in international TV and radio programs. Three quantities are relevant when specifying the time of day at a specified location: Standard timetstd of the time zone of the specified location is defined by the reference value of the longitude. For instance, in the contiguous United States, the reference meridians for the time zones are 75°W for Eastern, 90°W for Central, 105°W for Mountain, and 120°W for Pacific standard times. Most countries have only one reference meridian; i.e., for India, it is 82.5°E. The standard time is the watch time when daylight savings is not followed.Local civil time tciv,loc is the time at the specific location in question. A constant correction is needed, which accounts for the difference in longitude between the reference meridian and the local meridian. Since one full cycle of a day corresponds to 360° longitude, each degree corresponds to (24 h × 60 min)/360° = (1/15) h = 4 min. In most parts of the world, clocks are set to the same time within a time zone covering approximately 15° of longitude (although the boundaries may be quite irregular).Daylight savings time (DST) is an artificial change adopted by several countries worldwide. From several decades, most parts of western Europe and North America have instituted an advancement of the clock by 1 h during the summer half of the year (the “spring ahead, fall back” rule). The reason for adopting DST is that it improves the match between human activities and the availability of daylight, thereby resulting in humans consuming less energy. It also results in a reduction in overall building energy consumption (such as lighting electricity use).
The Effects of Daylight Saving Time (DST) Transition Cancelation on Work Accidents of Turkey
Published in International Journal of Occupational Safety and Ergonomics, 2023
Countries are intending to conduct energy conservation assessments as a result of the current global economic crisis, conservation incentives and rising energy prices. Natural light helps us save energy since the more people who utilize it, the less power is consumed. Electricity can be conserved during the DST since individuals have more time to use daylight in the evening and hence use fewer electric lights. DST transitions have been found to have a measurable impact on electric power consumption [8–10]. However, in today's world of artificial lighting and warmth, people schedule their activities according to the clock rather than the natural cycle of dawn and dusk [7,11].