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    Re: Santa Barbara 2016: Venus sight
    From: Stan K
    Date: 2016 Dec 19, 21:06 -0500
    Peter,

    If I am correct in assuming that the "anonymous benevolent user” is known to you, please pass this on.  I'd be interested in knowing if there is another definition of twilight out there.

    Stan


    -----Original Message-----
    From: Peter Hakel <NoReply_PeterHakel@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Mon, Dec 19, 2016 8:20 pm
    Subject: [NavList] Re: Santa Barbara 2016: Venus sight

    Stan,

    On this issue I have no comment, since for “Astron” I am just a messenger for “an anonymous benevolent user” who created this spreadsheet; my original spreadsheets do not calculate twilight info.


    Peter Hakel



    From: Stan K <NoReply_StanK@fer3.com>
    To: pmh099---.com
    Sent: Monday, December 19, 2016 10:38 AM
    Subject: [NavList] Re: Santa Barbara 2016: Venus sight

    Peter,

    I've been trying to send this privately, both on and off NavList, but the messages keep getting returned.  I thought you might have changed you address because of the Yahoo hack, but your messages seem to be coming from the same old address.

    Anyway, I have a question about the way Astron defines twilights.  All the definitions of twilight, whether civil or nautical (or astronomical) that I can find involve the sun, rise or set.  Morning twilight starts at the start of AM nautical/civil twilight and ends at sunrise.  Evening twilight starts at sunset and ends at the end of civil/nautical twilight.  Astron seems to define AM twilight as starting from the start of AM nautical twilight and ending at the start of AM civil twilight; PM twilight starts at the end of PM civil twilight and ends at the end of PM nautical twilight.

    If there is a reference that defines twilights this way, please let me know what it is.

    Stan






       
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