Re: Morning Pass Of ISS/Venus

From: Tom Wagner (sciteach1950@home.com)
Date: Fri Apr 27 2001 - 10:35:50 PDT

  • Next message: Allen Thomson: "Re: Morning Pass Of ISS/Venus"

    To see Venus with the unaided eye in a blue sky you need to use foveal
    vision. Your foveal (central) vision is a 1 degree across. Therefore,
    finding Venus in daylight is like trying to find a white speck against a sky
    full of floaters and whitish blobs (blood cells against your retina at the
    moment) all the while looking through a soda straw from Burger King.   :~o
    It's about impossible to find it for the first time unless you first know
    about where to look and spot it with binocs or a tele.
    
    Tom
    Iowa
    USA
    
    ----- Original Message -----
    From: "Ed Davies" <edavies@nildram.co.uk>
    To: "Sattelite Observation (E-mail)" <SeeSat-L@blackadder.lmsal.com>
    Sent: Friday, April 27, 2001 10:11 AM
    Subject: Re: Morning Pass Of ISS
    
    
    > Steve Adams wrote:
    > > BTW - What an incredible sight Venus is in the southern sky at the
    moment! -
    > > It almost looks bright enough to be seen in broad daylight.
    >
    > Venus is bright enough to be seen in broad daylight.  A more serious
    > than me amateur astronomer friend pointed it out to a group of us at
    > my gliding club launch point a few weeks ago at around midday.  He knew
    > where to look, of course.
    >
    > I think it helped a bit that there was a band of high cloud close by
    > allowing the eye to focus properly.  In a completely blue sky it is
    > harder to pick out such small points if your eyes aren't quite
    > focussed properly.
    >
    > Through binoculars Venus showed a crescent quite nicely.
    >
    > I was looking for Jupiter the other evening (a few days before the
    > STS-100 launch) just after sunset - mainly to try to estimate the
    > earliest time at which it would be at all sensible to try looking for
    > the ISS and/or shuttle (the STS-100 orbiter and ET were seen from parts
    > of Europe but it was just too light here to have a chance).  Even having
    > found Jupiter, without any other reference nearby, I still had to search
    > a bit to find it again a minute or two later.
    >
    > As it turned out, I was under a big shower as the STS-100 launch
    > went by.  The weather cleared up and I saw the ISS on the next pass
    > but by the time the orbiter came round again the orbit plane was
    > well to the south west and encrouching cloud from that direction
    > blocked the view.
    >
    > Ed Davies
    >
    > High Wycombe, England.  N51.608 W000.805.
    >
    >
    > P.S: I glad I'm not the only one who has trouble with spelling
    > words like "Satellite".  I never could get the hang of double
    > consonants.
    >
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