Message to the Bahá’ís of the world on the updated calendar of Bahá'í holy days. Includes a table of Bahá’í Dates 172 to 221 B.E., and a letter to an individual explaining the date of the astronomical new moon in Islamic and Bahá'í calendars.
Title taken from the "summary of contents" of this letter, as posted at bahai.org. Table below lightly updated by Mike Thomas and also provided in Word format (2021).
See many other resources, including an app and online converter, at badi-calendar.com.