This almanac provides astrological data and interpretations for the year 1987, focusing on the influence of the Moon's sign and phase on daily life. It aims to guide readers in understanding and utilizing lunar cycles for personal planning and decision-making. The book compiles astronomical calculations with astrological insights, drawing on established traditions of lunar astrology.

As an annual publication, Llewellyn's Moon Sign Book has historically served as a practical reference for individuals interested in astrology and lunar cycles. Its consistent release year after year suggests a dedicated readership seeking astrological guidance for planning and understanding personal events. The book's format as an almanac implies a focus on data-driven insights and actionable advice, catering to those who integrate astrological principles into their daily lives.