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Introduction to sites for the solstices

Two different methods of finding the day of the solstices were apparently used:_

Either very long alignments attempting to find the day of the solstice directly   or   by noting the day when the sun is at a chosen feature a few days before the say of the solstice and later the day as it again passed  the feature after the solstice. By 'Halving the Difference' of the total number of days, the actual day of the solstice can be found.

The latter method has the advantages that the alignments can be short (a few km.) and therefore often with an altitude above one degree. These factors are likely to minimise refraction effects.

Sites apparently utilising each of these methods are discussed.