(meteorobs) RE: Origin of ZHR is elusive

[Roberto G.]

From: "drobnock" <drobnock at penn.com>


> Hi
> Although English is the current language under discussion,  in the
> period of time the term "zenith hourly rate'  (zhr) was derived,  it may
> not have been call the ZHR. If it's origins are French, or German, or
> other language, it is possible then the term may just be the English
> translation of another language.
> 
> And at some point in time the term "zenith hourly rate" became the
> accepted standard.
> 
> The mathematics to derive the term would be the same in all languages.
> Yes?
> 
> (The formula is: ZHR = 1/sin L * R^(6.5 - m) * b * n.
> where:
> L = the height of the shower center on the sky
> R = a special value for each meteor shower
> m = the limiting magnitude
> b = a number that depends on how many that observed
> n = number of meteors seen in an hour )
> 
> Just labeled differently?
> 
> Any thoughts?
> 
> George John Drobnock

Very interesting point of view!
I think that the attention must to be on  R and b
I ever understand becaus it's utilised the letter R
b can to come from a system where it was too a term a.
Best greetings.
Roberto Gorelli

P.S.: in Italian ZHR it's TOZ (Tasso Orario Zenitale)
but it's never utilised and many time I must to said
what it's ZHR to the beginners.