[nine_k]

This is somehow expected when we talk about modern Israel. Maybe it would be less so when describing events of 1006 AD, if descried by contemporaneous Jewish sources.

Again, this a difference between astronomy and history points of view. In natural sciences, one would expect the now-universal units that originated in Western science: Julian calendar, SI units, times in UTC, etc. In historical and otherwise localized studies, I would expect a local / period-salient calendar, local units as reflected in the period's documents, etc. Converting these into exact modern dates and units is sometimes hard, and subject to a debate among historians.