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    Re: Timesight at sunset?
    From: Marcel Tschudin
    Date: 2013 Jan 11, 12:40 +0200
    For those of you who are also interested in the subject and would like to help enhancing my data set: You are welcome to provide your own timings of the last sun ray at the sea horizon. In this case please send me the following information:

    Time (UT) measured to +/-1s with a calibrated watch. (The watch should be accurate to +/-1s. Depending on the conditions the timing itself of the last sun ray may actually be considerably less precise.)
    Coordinates of observer (GPS or map) within e.g. about +/- 50m
    Height of eyes estimated within about +/- 20%
    (please mention if one of these values is expected to be less accurate than indicated)

    Environmental data of observation (they may eventually be from a nearby weather station with comparable conditions, in this case mention also the weather station where the data have been taken from):
    Atm. pressure and
    air temperature
    My intention is trying to improve the estimates (reducing the difference between observation and calculation) by using also the following additional information:
    rel. humidity in %,
    clouds (if possible covered amount estimated in %),
    wind speed and also the
    sea (surface) temperature (if known).

    Thank you.

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