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    Re: Extremely poor conditions, details.
    From: Richard B. Langley
    Date: 2012 Mar 21, 13:51 -0300

    I think it may have been mentioned on the list before but an excellent
    paper on astronomical refraction, including anomalous refraction, is
    the paper by Young:
    
    Title: Understanding astronomical refraction
    Authors: Young, A. T.
    Publication: The Observatory, Vol. 126, p. 82-115 (2006)
    Publication Date: 04/2006
    Origin: OBS
    Bibliographic Code: 2006Obs...126...82Y
    
    It can be downloaded from the SAO/NASA ADS Astronomy Abstract Service:
    
    http://adsabs.harvard.edu/abs/2006Obs...126...82Y
    
    The paper:
    
    Title: Refraction near the horizon
    Authors: Schaefer, Bradley E.; Liller, William
    Affiliation: AA(NASA, Goddard Space Flight Center, Greenbelt, MD),
    AB(Ministerio de Educacion de Chile, Instituto Isaac Newton, Santiago)
    Publication: Astronomical Society of the Pacific, Publications (ISSN
    0004-6280), vol. 102, July 1990, p. 796-805. (PASP Homepage)
    Publication Date: 07/1990
    Category: Astronomy
    Origin: STI
    NASA/STI Keywords: ASTROMETRY, ATMOSPHERIC REFRACTION, SEXTANTS,
    TEMPERATURE PROFILES, ASTROPHYSICS, AZIMUTH, HORIZON, SOLAR ECLIPSES,
    SUNRISE
    DOI: 10.1086/132705
    Bibliographic Code: 1990PASP..102..796S
    
    might also be of interest.
    
    It can also be download from the SAO/NASA ADS Astronomy Abstract
    Service:
    
    http://adsabs.harvard.edu/abs/1990PASP..102..796S
    
    -- Richard Langley
    
    On 21-Mar-12, at 12:57 PM, Alexandre E Eremenko wrote:
    
    >
    > Marcel,
    >
    >> The setting sun looks then like in the pictures shown
    >> here http://mintaka.sdsu.edu/GF/mirages/mirintro.html
    >
    > Unfortunately I did not pay attention at the setting Sun
    > (being occupied with Venus altitude). So I cannot say how it
    > looked.
    >
    > The record of the observations shows however that the coinditions
    > lasted several hours (at least 4), with roughtly the same errors,
    > including some time after the sunset.
    >
    > I still have to read the paper you refer to carefully.
    >
    > Next time I will carry a camera and fotograph the horizon
    > near the time of the altitude observation:-)
    >
    > Alex.
    >
    >
    >
    
    -----------------------------------------------------------------------------
    | Richard B. Langley                            E-mail:
    lang---.ca         |
    | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
      |
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    | Fredericton, N.B., Canada  E3B
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