Ante praesentem
Ante praesentem (scil. annum; abbreviatio Anglica BP, Francogallica AP) est simplex annorum tam archaeologicorum quam geologicorum mensura, aera Christiana vel communi suppressa. Annus praesens in disciplinis scientificis 1950 habetur.

Notae

Bibliographia 
 Lloyd A. Currie, "The Remarkable Metrological History of Radiocarbon Dating. II" in Journal of Research of the National Institute of Standards Technology vol. 109 (2004) pp. 185–217.
 Eric W. Wolff, "When is the "present"?" in Quaternary Science Reviews vol. 26 (2007) pp. 3023–24.

Archaeologia
Calendarium
Geochronologia
Geologia