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Letter from the editor

The Moon in Meso-America

"Meso-America, a large area extending from northern Mexico south to El Salvador, was unified by a calendar that incorporated a 365-day year and a continuous 260-day divination count, forming a larger Calendar Round cycle that repeated every 52 years. ..." – By Susan Milbrath

Solar Elemental Abundances

"Relative abundances by mass are rarely used. Sometimes the terms abundances and concentrations are used interchangeably. Concentrations refer to content as a part of the total system, and abundances refer to content in relation to contents of a reference species. ..." – By Katharina Lodders

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