Hebdomas
Hebdomas , etiam hebdomada  sive septimana est temporis spatium septem dies continens:

Hebdomas a Iudaeis et Chaldaeis inventa est.

Bibliographia 
 Colson, Francis Henry. 1926. The Week: An Essay on the Origin and Development of the Seven-day Cycle. Cantabrigiae: Cambridge University Press. OCLC 59110177.
 Bureau International des Poids et Mesures, The International System of Units (SI). 8a ed. Organisation Intergouvernementale de la Convention du Mètre, 2006.

Hebdomada Sancta

Nexus externi 
 Englisc Rímbóc: Calendarium Anglo-Saxonum

Calendarium
Unitates temporis