RE: Daylight vs. Standard Time

From: Chris Peat (chris.peat@heavens-above.com)
Date: Wed Oct 30 2002 - 03:58:35 EST

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    Hi All,
    Just for clarification - Heavens-Above calculations are all perfomed
    using UTC, and only when formatted for the web browser are they
    converted to local time. If daylight savings time ends during a pass,
    the end of the pass will be reported without daylight time and the start
    of the pass with, so the end time could be "before" the start.
    
    Chris
    
    Chris Peat, Heavens-Above GmbH
    E-mail: chris.peat@heavens-above.com
    WWW: www.heavens-above.com
    
    
    -----Original Message-----
    From: Tom Wagner [mailto:sciteach@mchsi.com] 
    Sent: 27 October 2002 21:52
    To: SeeSat
    Subject: Daylight vs. Standard Time
    
    
    Hi all,
    
    Last night I sent a member (Linda) a chart depicting a satellite pass
    that I obtained from Heavens-Above. As I recall the pass was going to
    occur this morning shortly after the official switch from daylight
    savings time to standard time, that is for many places in the US. Linda
    then brought up a good question that lead me to think of a hypothetical
    situation that I find interesting. [I'm afraid that the answer to this
    may be obvious to everyone but me. I just haven't taken a lot of time to
    think it through. :~) ]
    
    Here goes. Let's say that in Chris Peat's H-A program, daylight savings
    time switches over to standard time DURING a satellite's pass, like at
    local 2:00 AM. What then? Would the time listed be daylight savings time
    if the pass started before the switch or standard time if the switch
    occurred after the beginning of the pass?
    
    According to what we hear on the news, we were to "turn back our clocks
    one hour this Sunday (today here in the US) at 2:00 A.M."--like I'm
    going to get up to do that! :~) Now I have never thought about this
    before but since this is local time, or so it seems, does that mean that
    for one hour my local time is the same as one time zone west of me? If
    so, no wonder they make the official switch in the wee hours of the
    morning! It is no wonder many of you use Universal Time!
    
    Thanks for any mind relief anyone can give me.
    
    Tom
    Iowa
    USA
    .....
    
    Internet time? Now this is new to me. See:
    http://www.jamesshuggins.com/h/tek1/internettime.htm
    
    
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