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*To*: sbigelow@sprint.ca*Subject*: Re: FYI: AoA's News release on MH '99 (dumb)*From*: Huw Powell <audi@mediaone.net>*Date*: Wed, 01 Sep 1999 03:18:10 -0400*CC*: quattro@audifans.com*Organization*: HUMAN Speakers*References*: <25437@isham-research.demon.co.uk>*Reply-To*: one@humanspeakers.com*Sender*: owner-quattro@audifans.com

> > Parsec: a unit of steller distance, equal to about 3.25 light years (3.08 * > > 10^16 metres), the distance at which the mean radius of the earth's orbit > > subtends an angle of one second of arc. > > > > I don't understand it either. *s* oops, I got my angle backwards. the vertex is at the distant object. thanks At a distance of one parsec the angle between the lines from it to the earth, six months apart, is one second of arc (one 3600th of a degree) it has to be the correct six months, of course, the two opposite measurements have to be on a line perpendicular to the direction of the distant point... MAC: this is also useful for determining the distance of ofcifers operating radar guns. Don't ask me how. -- Huw Powell http://www.humanspeakers.com/audi/ 82 Audi Coupe; 84 4kq; 85 Coupe GT; 73 F250

**References**:**Re: FYI: AoA's News release on MH '99 (dumb)***From:*quk@isham-research.demon.co.uk (Phil Payne)

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