Dates and calendars in Potterverse

[Geoff Bannister]

No: HPFGUIDX 97592

--- In HPforGrownups at yahoogroups.com, "leaverish" <casieloo at b...> 
wrote:
> Tammy wrote: 
> > How do you expect to reconcile literary astronomical 
> > indicators to real world dates when, for five years 
> > now, September first has been a Sunday?  Doesn't that 
> > just scream out that JKR is not using a real world 
> > calendar?  
> 
> 
> Sorry, maybe I'm missing something, and this must have been said 
> before, but how can there be a question regarding the real date of 
> the happenings in the books? We have explicit info on this.
> In CoS nearly headless Nick has his 500th death day, and we're told 
> he was killed in 1492. Ergo, CoS happens in 1992.
> 
> Leaverish

Geoff:
I didn't originally raise this point, but perhaps I will now. Where
does the support for 01/09 having been a Sunday for five years come
from?