When the direct rays of the Sun hit the equator, it is either the Vernal (Spring) Equinox or the Autumnal Equinox, when there are 12 hours of sunlight and 12 hours of darkness in one 24 hour day.
<span>When the direct rays of the Sun hit the Tropic of Cancer it is the Summer Solstice in the Northern Hemisphere. The day of the year with the most sunlight hours in the Northern Hemisphere, and the least sunlight hours in the Southern Hemisphere. </span>
<span>When the direct rays of the Sun hit the Tropic of Capricorn it is the Winter Solstice in the Northern Hemisphere. The day of the year with the least sunlight hours in the Northern Hemisphere, and the most sunlight hours in the Southern Hemisphere.
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<h3>This paper traces the history of human-environment interactions in the Pacific Islands during the last millennium, focusing on three main periods: the Little Climatic Optimum, the Little Ice Age, and, in greatest detail, the transition around A.D. 1300 between the two. The Little Climatic Optimum (approximately A.D. 750–1300) was marked by warm, rising temperatures, rising sea level and probably increasing aridity. The latter condition was linked to development of water-conservatory strategies (agricultural terracing being the most common) requiring cooperation between human groups which facilitated formation of large nucleated settlements and increased sociopolitical complexity. The transition period (approximately A.D. 1270–1475) involved rapid temperature and sea-level fall, perhaps a short-lived precipitation increase. Temperature fall stressed crops and reef organisms, sea-level fall lowered water tables and exposed reef surfaces reducing their potential as food resources for coastal dwellers. Increased precipitation washed away exposed infrastructure. Consequently food resource bases on many islands diminished abruptly across the transition. The Little Ice Age (approximately A.D. 1300–1800) was marked by cooler temperatures and lower sea levels. The lingering effects of the earlier transition largely determined human lifestyles during this period. Conflict resulted from resource depletion. Unprotected coastal settlements were abandoned in favour of fortified inland, often upland, settlements. Climate change is suggested to have been a important determinant of human cultural change during the last millennium in the Pacific Islands.</h3>
<h2>Journal Information</h2>
<h3>Environment and History is an interdisciplinary journal which aims to bring scholars in the humanities and biological sciences closer together, with the deliberate intention of constructing long and well-founded perspectives on present day environmental problems.</h3>
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<h2>Rights & Usage</h2>
<h3>This item is part of a JSTOR Collection. </h3><h3>For terms and use, please refer to our Terms and Conditions </h3><h3>Environment and History © 2001 White Horse Press </h3><h3>Request Permissions</h3>
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The northern hemisphere is located between the Equator and the North Pole.
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I’m pretty sure the mature river is the bottom one, the old river is the middle and the young is the top. Hope I’m helpful..