In acronyms, AD (LH:6), as compared to BC, is short for “Anno Domini” (Latin), meaning “Lord Year”, which, in the Dionysius calendar (525AD) system, fixes the “zero year” to the birth of the Lord Jesus Christ.
The AD/BC dating system was invented in 525AD by Dionysius Exiguus, therein usurping the older AUC dating system (Caesar, 46BC), aka “Anno Urbis Conditae” (Latin) or “Urban Construction Year”, that fixed the zero year to the founding of Rome (753BC). The Dionysius dating system became popular, in western Europe, after Bede, in his Ecclesiastical History of the English People (731), began to use it to date events; in c.800AD, during the reign of Charlemagne (742-814), the Dionysius calendar became the official dating system of the Roman empire.
The difficult with the Dionysian calendar is that, per the silent historians problem, the “zero year”, is fixed to a “murky” gray area window that spans nearly two centuries of uncertainty, as to when either Christianity was founded or when the fictional character of Jesus became a cultural staple or meme.
In 2020AD, Libb Thims introduced the “year of atoms seen” based calendar system, aka Thimsian calendar, which fixes the “zero year”, i.e. Anno Elementum (Latin) or “After Atoms”, to 1955AD, the year when a human, namely Erwin Muller, first saw an atom with their own eyes. This dating system was invented out of a need to date the title page of Thims' Human Chemical Thermodynamics manuscript, scientifically.
- Thims, Libb. (2021). Human Chemical Thermodynamics: Chemical Thermodynamics Applied to the Humanities – Meaning, Morality, Purpose; Sociology, Economics, Ecology; History, Philosophy, Government, Anthropology, Politics, Business, Jurisprudence; Religion, Relationships, Warfare, and Love (pdf). Publisher.
- Anno Domini – Wikipedia.