Midday -vs- Noon (was: Re: Konica 120 infrared)

[Nick Cuccia <cuccia@xxxxxxxxxxxxx>]

On Sat, 07 Sep 1996 16:57:21 +0100  Willem-Jan Markerink wrote:
>> On  6 Sep 96 at 19:51, JoePaduano@xxxxxxx wrote:
>> > Strong sunlight is best to achieve strong contrast & the infrared 'look' of
>> > white vegetation.
>> >  Infrared reflection is strongest at midday and in the summer. 
>> Mmm....what do you mean with midday? As opposed to noon?

Midday is a better term, in my opinion, for a number of reasons:

        * Each time zone roughly spans approximately 15deg of longitude, or
          1/12 of a hemisphere.  This means that if the sun is at its highest
          point at noon on the eastern edge of the time zone, it will at its
          highest at 1p on the western edge.

        * The above assumes "standard time", and not "daylight savings time" in
          jurisdictions which time-shift during spring, summer, and autumn
          months.  Since in such jurisdictions the shift is forward an hour
          during those months, this moves the highest point of the sun out to
          about 1p.

The best way to determine the actual time at which the sun is at its highest
point at your particular location is to measure shadowlengths, noting the time
at which the shadow is at its shortest.

--Nick

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Topic No. 2