RE: ISS 5 consecutive passes

From: Dale Ireland (direland@drdale.com)
Date: Sat Aug 10 2002 - 11:46:16 EDT

  • Next message: Alan Pickup: "Decay watch: 2002 August 10"

    ???? maybe you better DO THE MATH again, that works out to 7 hrs and 45min
    minimum. How many degrees below the horizon is the Sun at both ends of that?
    It appears to be almost exactly the time between sunrise and sunset at your
    latitude that day, 7hrs 52min.
    
    The record is 6 as I said, beat that.
    Even 1 or 2 degrees below the horizon is "certainly" not adequate, and the
    first and last pass (when the sky is very bright) are both very low near the
    horizon, and the passes would have to be timed perfectly which doesn't
    happen.
    
    Let me know when you actually do it.
    Dale
    
    > -----Original Message-----
    > From: Larry Wood [mailto:chukwood@telusplanet.net]
    >
    > On night of July 24/25 each ISS pass is sunlit for some portion
    > of each pass as
    > seen from my location. The sun is at least 3° below our horizon
    > (certainly dark
    > enough for the ISS) from 10:13 p.m until 5:13 a.m,
    >
    > 7 hours  and how long is each orbit???  < 93 minutes
    >
    > You do the math.
    >
    > We have two windows each year in which we can see 5 consecutive  passes.
    >
    > Larry Wood
    > W 113.565   N 53.558
    >
    >
    > >
    > > I've seen 4, I think the record and theoretical max is 6.
    > > 52 N is too far north because the alignment has to occur in local
    > > spring-summer and at 52 north the period of darkness is too short. The
    > > optimum latitude is 35-40, longer night, still adequate elevation at
    > > farthest north pass.
    > > Dale
    >
    
    
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