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    Re: Lunar Distances with Alex's SNO-T
    From: Bill B
    Date: 2006 Oct 31, 16:35 -0400

    Alex
    
    I have a topo map for our area.  My apartment is just about 705 feet above
    sea level.  Yours should be close, perhaps a bit lower.  The Wabash river in
    is approx. 520 ft in Lafayette/West Lafayette.  Will look up your place if
    you wish.
    
    According to USA Today:
    
    http://www.usatoday.com/weather/resources/askjack/wfaqpres.htm
    
    "The pressure reported for Denver, or any official observation station for
    that matter, is not the actual pressure on the surface, but rather is the
    pressure corrected to sea level. The reason this is done is so that
    meaningful maps of constant pressure lines, called isobars, can be drawn for
    stations across the USA. These maps are useful for picking out areas of
    relative high and low pressure. If pressure readings were not corrected,
    places like Denver would almost always have lower pressure than spots at
    lower elevations. Essentially, the map would reflect topography, rather than
    weather systems in the atmosphere."
    
    A while back Frank, if I recall, gave a method for converting the broadcast
    barometric pressure to local station pressure.
    
    On a calculator divide your altitude above see level by -32000 (maybe
    -34000?).  Then hit (on my TI-30XA) 2nd then LN.  (You are looking for e^x,
    the mathematically inclined can say it better, but that's the cookbook
    method).
    
    Multiply the broadcast pressure by the above result to get local (station)
    pressure.  I use it with inches Hg, so not sure if it also works in
    millibars, but don't see why it would not.  Perhaps Frank can clear up my
    fuzzy memory.
    
    There is some interesting information a well as a formula at:
    
    http://en.wikipedia.org/wiki/Atmospheric_pressure
    
    Bill
    
    
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