Post Diaspora
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Post Diaspora (PD) is the dating scheme used by most of the planets in David Weber's Honor Harrington science fiction series. Most planets also use a local calendar based upon the orbit of the planet around its star, which often uses the date of landing on the planet as its beginning year. The year 2103 AD is equal to the year 1 PD. On September 30 of that year, the first interstellar ship, Prometheus, departed the Sol system, beginning the era of sublight colonization.