Re: Morning Pass Of ISS/Venus

From: Allen Thomson (
Date: Fri Apr 27 2001 - 12:41:48 PDT

  • Next message: Alan Pickup: "Decay watch: 2001 Apr 27"

    Tom Wagner said
    > 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
    > 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.
    (Hopefully this isn't too much off charter, now that another Venus-bright
    satellite is up there.)
    What you say is generally true -- I've seen Venus in the day sky a fair
    number of times, but always by sighting along a telescope pointing at it.
    Except once, in El Paso, when we were watching an air show over Ft. Bliss
    from the terrace of a friend's house on the eastern side of the Franklin
    Mountains.  We were in the shade (it was early/mid afternoon)  and the sky
    was an unusually deep blue.  A few days before, I'd tried to find Venus in
    the daytime sky and failed, but glancing up then, by gosh, there it was not
    far from the zenith, quite plain to see.  I pointed it out to the others
    there, and everyone saw it without much trouble.
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    This archive was generated by hypermail 2b29 : Fri Apr 27 2001 - 12:42:10 PDT