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from article Archeoastronomy
Angular swing of the Sun along the horizon at rising and setting from solstice to solstice. The angle is for a latitude of 36°, that of the North American Southwest.
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Image
from article Archeoastronomy
Monthly angular swing of the Moon along the horizon at moonrise, for times of maximum angle (major standstill) and minimum angle (minor standstill). The angles are shown for a latitude of 36°.
Image
from article Archeoastronomy
Inner great trilithons of Stonehenge. (Courtesy of O. Gingerich)
Image
from article Archeoastronomy
Diagram of the major features of Stonehenge that may have been used astronomically. (After O. Gingerich, in K. Brecher and M. Feirtag, eds., Astronomy of the Ancients, MIT Press, 1979)
Image
from article Archeoastronomy
Fajada Butte in Chaco Canyon. (a) View of entire butte (photo by M. Zeilik). (b) Rock slabs near the top of the butte. They rest against the rock surface on which two spirals are pecked. Their upper edges cause sunlight in late morning to play upon…
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from article Archeoastronomy
Wijiji site in Chaco Canyon. (a) Painted white sun symbol above the ledge near the ruin. The emblem resembles that of the Zia pueblo sun symbol and a sun symbol on a war shield from Jemez pueblo. (b) Winter solstice sunrise observed from the ledge…
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from article Dendrochronology
Ring patterns showing complacent and sensitive ring series. (a) Climate has minimal effect on ring widths when trees have ample moisture every year. (b) Maximum ring-width variations occur on sites where growth is limited by factors that vary from…
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from article Dendrochronology
Core being taken from a tree with an increment borer. (Courtesy of Laboratory of Tree-Ring Research, University of Arizona)
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from article Dendrochronology
Chronology building. Chronologies are extended backward in time by matching patterns of wood samples whose ages overlap.
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from article Dendrochronology
Skeleton plot (top) from an idealized tree-ring sequence in a specimen (bottom). Ring widths are represented by vertical lines in inverse proportion; that is, tall lines represent narrow rings. An exceptionally wide ring is designated by the letter…
