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Re: (meteorobs) Radiant rising time



Rob 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.


Being mathematically depraved, but reading between the lines about the low
velocity showers, the amount of zenithal attraction (ZA) must be
velocity-dependent. If this is the case, is there a minimum and maximum
amount of ZA that can occur based on velocities alone? Or is this
simplifying the problem too much?

Also, by coincidence, there is a short discussion related to zenithal
attraction in an article by Jim Richardson in the latest issue of Meteor
Trails. Haven't gotten a chance to read it though. :(

Mark Davis



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