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RE: (meteorobs) Radiant rising time



Robert:  "Zenithal attraction" is a new term to me.  Can you take a minute 
to explain it?  Should this effect be taken into consideration if one is 
determining the time of a radiant's rising for the purpose of watching for 
tangential meteors or "skippers?"  If so, what is its value, or how is its 
value determined?

Thanks,

George Kelley


Robert McNaught wrote:

>Note that when calculating radiant rise time, the zenithal attraction must
>be taken into account.  For low-velocity showers this amounts to several
>degrees.  The radiant rise is when the depression angle (angle below the
>horizon) equals the zenithal attraction for observed radiant on the
>horizon.

>Cheers, Rob

>Robert H. McNaught
>rmn@aaocbn.aaodot gov.au



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