The rhythm that nature and biology bound all have him and metrical, replace of the four seasons, sunrise sunset. You can discover in the life, the sunrise sunset time of different area can exist difference, for example, when August 2, 2018, be located in north latitude the sunrise time of the arctic village of 53 ° is 4:11, sunset time is 19:42; Be located in north latitude the sunrise time of the Amsterdam of 52 ° is 6:02, sunset time is 21:29. Nevertheless, the time of area sunrise sunset with general similar latitude is similar also, and close of latitude of these two areas, why is the difference of sunrise sunset time such big?
The factor that affects sunrise sunset has a lot of, day is for instance long, relief (relief is high, sunrise is early, sunset evening, sunshine time is long) , weather situation.
Take no account of relief and weather situation, why do two ground sunrise and sunset time differ two many hours?
The alpenglow of the Amsterdam
Above all, the sunrise sunset time of two ground and place close from time to tome. The hour that shows by this locality longitude determines is when the place. The time of earthly rotation a week makes an appointment with 24 hours, every other of earthly surface longitude 15 ° , local hour can differ 1 hour.
Every warp on the earth has his time. To convenient managing, 1879, volt states Canadian railroad engineer put forward " zone time " concept. Zone time points to the time of an area, every be apart 1 ° differs 4 minutes, limits of longitude of every 15 ° on the earth serves as a time zone (namely the longitude that the sun has walked along inside a hour) . Such, the surface of whole world is differentiated for 24 time zone. And what the time of Amsterdam and arctic village all uses is zone time.
In the meantime, the time zone that is in through British capital London the regulation is zero hour area, the warp that London is in is 0 ° , for the central warp of zero hour area. The central warp of other time zone is the multiple of 15, for instance thing classics classics of 30 ° of 15 ° , thing classics, thing 45 ° , arrive all the time 180 ° are longitudinal. In every central longitudinal thing all ground inside limits of each 7.5 ° choose two side, uniform use this the standard regards as hour when central longitudinal place. To the thing from zero hour area two side are 12 time zone each minutes, in the thing the line is changed for international date between 12 areas. Eastwards date decreases one day, to date increases one day on the west.
When undertaking time zone is calculated, the place longitude that we need to demand place only is divided with 15, if remainder is less than 7.5, criterion the time zone that business seeks a site for place; If remainder is more than 7.5, criterion business + the 1 time zone that seeks a site for place. For instance, the longitude that Beijing is in is 116 ° E, 116/15=8 beyond 4, be less than 7.5, because this Beijing is in time zone,be east 8 areas. It is when Beijing time 12: 00 when, it is when the place of Beijing 11: 44. And Amsterdam place longitude is 4 ° E, in 7.5 ° E with on the west, should be zero hour area.
Besides above academic time zone is calculated, still a few special time zone differentiate. Our country manages to unite, total national capital is used east the time of 8 areas. Time of time of beautiful state-owned Pacific Ocean, mid time, the eastpart part, a mountainous area time. Still a few areas use half time zone, for instance India. Additionally a few countries do not use him to be in the time of time zone, for instance Holand, France, Belgium. Although be located in zero time zone from longitude computation, but to mix while of European most country agrees, these countries were used east the time of one area. This also is why the reason with the sunrise later sunset of Holand Amsterdam.
The sunset Zheng annals of arctic village is photographed
Besides above special zone time differentiates, holand still used Xia Shi to make. Xia Shi is made say again " make when sunlight is managing " and " between daylight saving time " , it is the zone time system of a kind of for managing the sources of energy factitious regulation. It is commonly in the summer with early day break, move time artificially fast a hour, can make so person keep early hours, reduce illume amount, in order to make full use of illumination resource, thereby managing illume uses phone.
Although Amsterdam and arctic village are latitudinal similar, but fall in the circumstance that takes no account of relief and weather situation, because Xia Shi controls the account with time zone, the difference with brought about the sunrise of two ground and sunset time to appear certain.
