Where Does The Sun Rise And Set?

L>Sunrise và Sunset
Where Does the Sun Rise and Set? Most people know that theSun "rises in the east & sets in the west".However, most people don"t realize that is a generalization.Actually, the Sun only rises due east và sets due west on2 days of the year -- the spring and fall equinoxes!On other days, the Sun rises either north or south of "due east"and sets north or south of "due west."Each day the rising và settingpoints change slightly. At the summer solstice, the Sun rises as farto the northeast as it ever does, & sets as far khổng lồ the northwest.Every day after that, the Sun rises a tiny bit further south.Atthe fall equinox, the Sun rises due east and sets due west. Itcontinues on it"s journey southward until, at the winter solstice, the Sun rises are far to the south as it ever does,and sets as far lớn the southwest.Many, if not most, prehistoric cultures tracked theserising và settings points with great detail.If they had jagged mountains along the horizon, the exact points could bereadily remembered. Without a suitably interesting horizon, standing stonescould be arranged lớn line up withthe various rising & setting points. Or, tree poles could replacethe standing stones. Or, rock cairns could be used. How does this work? The dioramas simulate the rising and setting points of the Sun,and its tracks across the sky at summer solstice(longest track), winter solstice (shortest track), & the spring và fallequinoxes (medium track). A bead placed on one of the trackssimulates the Sun rising along the eastern horizon, travelong along the sky,and setting on the western horizon. Imagine a tiny version of yourself standing in the middle of the wooden disk. Andimagine that the outside rim of the disk represents your horizon. On SummerSolstice, you would see the Sun rise on your "horizon" at the eastern point of thelongest track.

Bạn đang xem: Where does the sun rise and set?

Xem thêm: Giải Phương Trình: (Đh B - Giải Phương Trình Sinx(1+Tanx

Xem thêm: Đoàn Viên Có Mấy Nhiệm Vụ - Nhiệm Vụ Và Quyền Hạn Của Đoàn Viên

It would follow the track high in your sky, & eventuallyset on the western horizon. It would be up for about 17 "hours", thus makingsummertime days long & warm.On the Winter Solstice, you would observe the Sun rising at the western over of thesmallest track. It wouldn"t rise high in the sky, và would be up for only about6 or 7 hours, making your days short on daylight and cold.At the Spring & the Fall equinoxes, the Sun would rise at the east kết thúc of the middletrack & set at the west end. Your days would be exactly half daylight và half nighttimeand you would experience typical warm/cool spring và fall climates.Build your own Sun Track DioramaWhat about the stars?The rising points of the stars don"t change as much as the Sun"s becausethey are so very far away. So the rising points of stars on the horizon werenot as critical to ancient cultures.However, the rising times of stars change by 4 minutes each day, soany particular star would rise at different times during the year. Forabout half the time, the star would rise during the daytime & thus beblocked by the huge light of our Sun.There was something calledthe "heliacal" or dawn rise of a star -- & this happened on only one day ofthe year.Thus these dawn rising were extremely useful for keeping track of exact days.For an explanation và examples of heliacal or dawn risings of stars, seeShow Me a Heliacal Rising. Image credits:Medicine Wheel sunset photograph by Tom Melham.The Tom Melham picture appeared in the National Geographic. According lớn them, it is part of a collection"Mysteries of Mankind: Earth"s Unexplained Landmarks" & the imageis listedas usuable, with no permission or payment required. Just need togive credit, which is: Medicine Wheel sunset photograph by Tom Melham. Native American Suntrack Diorama photo và design by Ginger Armstrong, Kelseyville, CA.Seasons Suntrack Diorama photo by Ben Buress, Chabot Space & Science Center.Suntrack dioramas designed by Deborah Scherrer & Barbara Scherrer. ©2005-2021 by bossvietnam.vn SOLAR Center | Permitted Uses | Credits