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I have seen suggestions to use Venus in the day in some texts.

Fred

On May 28, 2004, at 4:55 AM, Trevor J. Kenchington wrote:

> Doug Royer, extending standard technique from faint stars to the
> brightest of planets, wrote:
>
>> Try this trick also on Venus as one may view Venus in early C.T. when
>> conditions are right.
>
> If you know just where to look, Venus can be visible to the naked eye
> in
> full daylight. I have only tried finding it the once but, that time, I
> did find it. Needed some concentration to keep it in sight though,
> since
> you have to look in exactly the right place or it disappears. (Maybe it
> needs the higher resolution of your retina's fovea to be able to
> distinguish the small patch of brighter light from the general
> brightness of a blue sky.)
>
> Why can't we use Venus to get a day-time position line? I'm guessing
> that a sextant telescope doesn't help because its light-gathering power
> brightens the blue sky as much as the planet, meaning that it is no
> easier to hold the image with a sextant than to view Venus with a naked
> eye, hence making the observation impractical.
>
>
> Trevor Kenchington
>
>
> --
> Trevor J. Kenchington PhD                         Gadus@iStar.ca
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