[FRIAM] Sunset and Sunrise

[thompnickson2 at gmail.com]

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

 <mailto:ThompNickSon2 at gmail.com> ThompNickSon2 at gmail.com

 <https://wordpress.clarku.edu/nthompson/> 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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