Arithmometer

The arithmometer is a mechanical device using rotational logic to perform calculations. The first modern production model was invented by Salsifer Pentane in 1042 MEplugin-autotooltip__small plugin-autotooltip_bigModern Epoch (ME)

The Modern Calendar is a dating system acknowledged throughout the Civilised World. It numbers years from the Modern Epoch, abbreviated ME and BME (Before Modern Epoch). It is also called the Modern Era.

Calendar

This is in a series of articles about calendars and dating systems.OrorrHartheraHMOrorrHartheraOrorrOrorrHMHartheraHMHartheraOrorr, though this claim is controversial since the ancients almost certainly had comparable devices.

Arithmometers are most used by the Hartheran Navy and Hartheran government in creating charts, statistics and navigational data. Harlon University has several devices used for publishing commercial log books, and for research in maths, engineering and astronomy.