[FRIAM] Sunset and Sunrise

[Roger Critchlow]

https://www.herts.ac.uk/about-us/media-centre/news/2020/longest-known-exposure-photograph-ever-captured-using-a-beer-can

Science progresses by grad students forgetting what they're doing and
leaving their experiments running after they leave school?

I was going to explain your rise/set/length paradox, but my explanation got
confused in my head.  But you can do it yourself.
https://www.esrl.noaa.gov/gmd/grad/solcalc/solareqns.PDF contains the
formulae for computing the time of sunrise and sunset given the
date, longitude, and latitude.  It's less than two pages of text and
they're in Boulder so they even mention Mountain Standard Time at one
point.  Hundreds of thousands of years of human worrying about when the sun
will rise and when it will set, all boiled down to 11 equations.

-- rec --


On Wed, Dec 30, 2020 at 12:38 AM <thompnickson2 at gmail.com> wrote:

> Yes.  I see.  Nifty. But it repeats the assertion that the tilting of the
> earth also has to do with it.  Could it be that the fact that the earth is
> not quite a sphere be playing a role, in  which case the tilting on the
> axis would make a difference?  Where are all our knowitall nerds when we
> need them.  (};-)]
>
> N
>
> Nicholas Thompson
>
> Emeritus Professor of Ethology and Psychology
>
> Clark University
>
> ThompNickSon2 at gmail.com
>
> https://wordpress.clarku.edu/nthompson/
>
>
>
>
>
> *From:* Friam <friam-bounces at redfish.com> *On Behalf Of *Frank Wimberly
> *Sent:* Tuesday, December 29, 2020 9:27 PM
> *To:* The Friday Morning Applied Complexity Coffee Group <
> friam at redfish.com>
> *Subject:* Re: [FRIAM] Sunset and Sunrise
>
>
>
> Try this one, Nick.  It sounds like what you're saying:
>
>
>
> http://wxguys.ssec.wisc.edu/2019/12/16/solarday/
>
> ---
> Frank C. Wimberly
> 140 Calle Ojo Feliz,
> Santa Fe, NM 87505
>
> 505 670-9918
> Santa Fe, NM
>
>
>
> On Tue, Dec 29, 2020, 8:18 PM <thompnickson2 at gmail.com> wrote:
>
> Frank,
>
>
>
> Andl notice another thing.  The sentence is, on its face, nonsense.  The
> tilting of the orbit has nothing to do with its elliptical shape.
>
>
>
> I have tried to figure out the answer to this question for years and the
> only explanation that I have come up with is that during the period from
> early December to early January, the days stay roughly the same length but
> noon moves.  It has to do with the analemma
> <https://www.space.com/3304-earth-closest-sun-dead-winter.html#:~:text=The%20noontime%20position%20of%20the%20Sun%20in%20the,line%20running%20through%20the%20analemma%20is%20the%20meridian.>.
> Notice that the day-to-day path of the highest sun is moving parallel to
> the horizon and perpendicular to the meridian during that period. If you
> think of that moment as “noon”, noon is moving.   But why the analemma?
> Your guess is as good as mine.
>
>
>
> Have you noticed that the rising full moon is moving rapidly up the
> horizon.  By march it will be rising in the NE.
>
>
>
>
>
>
>
> Nicholas Thompson
>
> Emeritus Professor of Ethology and Psychology
>
> Clark University
>
> ThompNickSon2 at gmail.com
>
> https://wordpress.clarku.edu/nthompson/
>
>
>
>
>
> *From:* Friam <friam-bounces at redfish.com> *On Behalf Of *Frank Wimberly
> *Sent:* Tuesday, December 29, 2020 8:48 PM
> *To:* The Friday Morning Applied Complexity Coffee Group <
> friam at redfish.com>
> *Subject:* [FRIAM] Sunset and Sunrise
>
>
>
> This topic came up at a recent meeting.  The word "main" makes me wonder
> what the other reasons are.
>
>
>
> The main reasons for the *earliest* sunset to occur in early December and
> the *latest sunrise* to occur in January are the fact that Earth's axis
> is tilted (23.5°) and Earth's orbit around the sun is *not* a perfect
> circle shape.
>
>
>
> --
>
> Frank Wimberly
> 140 Calle Ojo Feliz
> Santa Fe, NM 87505
> 505 670-9918
>
>
>
> Research:  https://www.researchgate.net/profile/Frank_Wimberly2
>
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