Part One : History of calendars. Basic questions all calendars must answer
History of lunar and lunisolar calendars
The history of solar calendars
Calendar reform since the mid-eighteenth century


Part Two : Calendars and holidays for religious groups. Judaism
Zoroastrianism
Christianity: Roman Catholic and Protestant expressions
Christianity: Orthodox expressions
Christianity: Non-trinitarian and non-traditional expressions
Islam
The Bahá'í faith
Hinduism
Jainism
Sikhism
Buddhism
Taoism, Confucianism, and Chinese folk religions
Shinto
Native American religions
Paganism
Western African religions and their new world expressions
Ancient wisdom, metaphysical and other faith communities


Part Three: Appendices. Appendix A: Sources for more information
Appendix B: Bibliography and additional reading.