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Marking Time in the Inca Empire

Journal of Skyscape Archaeology

Equinox Publishing

10.1558/jsa.v1i2.28257

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Most cited references 14

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Forecasting Andean rainfall and crop yield from the influence of El Nino on Pleiades visibility

Farmers in drought-prone regions of Andean South America have historically made observations of changes in the apparent brightness of stars in the Pleiades around the time of the southern winter solstice in order to forecast interannual variations in summer rainfall and in autumn harvests. They moderate the effect of reduced rainfall by adjusting the planting dates of potatoes, their most important crop. Here we use data on cloud cover and water vapour from satellite imagery, agronomic data from the Andean altiplano and an index of El Nino variability to analyse this forecasting method. We find that poor visibility of the Pleiades in June-caused by an increase in subvisual high cirrus clouds-is indicative of an El Nino year, which is usually linked to reduced rainfall during the growing season several months later. Our results suggest that this centuries-old method of seasonal rainfall forecasting may be based on a simple indicator of El Nino variability.
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Brian S. Bauer. The sacred landscape of the Inca: the Cusco ceque system. xiv+249 pages, 128 b&w photographs, 27 maps, 8 figures, 10 tables. 1998. Austin (TX): University of Texas Press; 0292-70865-3; hardback; US\(50

R Zuidema (2002)
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Handbook of Archaeoastronomy and Ethnoastronomy

Author and article information

Journal
Journal of Skyscape Archaeology
JSA
Equinox Publishing
2055-348X
2055-3498
December 30 2015
August 30 2015
: 1
: 2
: 217-241
© 2015
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