3rd From Sol

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Solstices and Sunshine In North America

01 Wednesday Dec 2021

Posted by Paul Kiser in Astronomy, Daylight Saving Time, Science, solar, Space, United States

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Earth tilt, life on earth, seasons, solar heating, solstices, summer solstice, winter solstice

We know that solstices are different. It’s colder around the winter solstice and warmer around the summer solstice. We also know that the days are shorter and the Sun is lower in the sky during the winter¹ and that in the summer the days are longer and the Sun is higher in the sky.

[¹In higher latitudes both north and south.]

Afternoon Sun at the Winter Solstice (2019 Reno, Nevada)

People with a high school education probably know that the seasons have to do with the tilt of the Earth’s axis and its orbit around the Sun. And every year, people living north of 30° north latitude or south of 30° south latitude also experience the differences between the summer and winter solstice.

But what does it look like?

Solstices From the Sun’s Perspective

Most of humanity has experienced the solstices from one perspective: standing on the Earth. Astronauts have been able to see Earth from a different perspective, but even they don’t have an immediate comparison of the summer and winter solstices because there is a six-month time lag between them.

Fortunately, we can use a globe and a flashlight to help us visualize the difference between the summer and winter solstice from the Sun’s perspective. Using San Francisco, California, USA as our focal point, we can see how the angle of the Sun’s radiation differs between June and December in the northern hemisphere.

Solstices Sunrise

I’ve used my son’s Kylo Ren figurine standing on the San Francisco Bay area to mark the place on the globe. It should be noted that at this scale, Kylo Ren would be twice the height of the orbit of the International Space Station (ISS).

In Images 1a and 1b, it may not be obvious what is different between the winter and summer solstices; however, in the winter, the Sun is directly over South America as the Sun rises in San Francisco. In the summer, the Sun has yet to reach the South American coast.

What is apparent is that at sunrise in San Francisco, the Sun’s angle is from the east in the summer, and in the winter, the Sun’s angle is from the southeast. 

Image 1a –                       Winter Solstice Sunrise

Image 1b –                   Summer Solstice Sunrise

 

 

 

 

 

 

 

 

[NOTE:  A flashlight does not accurately demonstrate the Sun’s light on the Earth. The light of the Sun reaches farther around the curvature of the Earth. Also, the camera is slightly to the right of the light source in these images.]

High Noon

At the point when the Sun is highest in the sky, the difference in solstices is more apparent. In the summer, the Sun is nearly directly overhead but in the winter the Sun is low in the southern sky for North America. [SEE: Images 2a & 2b]

During the winter, people in the United States may find that the Sun is directly in their eyes when facing south. We tend to connect the wearing of sunglasses in the summer, but for people driving in a southerly direction during the winter, the glaring Sun may necessitate sunglasses.

Image 2a –                          Winter Solstice Noon PST

Image 2b –                     Summer Solstice 1 pm PDT

 

 

 

 

 

 

 

 

Arc In Daylight

The visual that may be best at showing the difference in the solstices is the arc of daylight experienced by a person in winter and summer. The path a person follows in San Francisco during the winter is less than two-thirds the length of the path during summer.

Most of North America crosses the fringe of the solar exposure in the winter while the summer offers a day that is two to three hours longer than on the equator. All this may seem obvious but the differences in the solstices is something that is easier to see modeled than experienced as a passenger on Earth.

Image 3a-b                                                                                        Solstices Arc of Daylight for San Francisco, California

Winter Solstice and It’s Impact on Humans

19 Thursday Dec 2019

Posted by Paul Kiser in All Rights Reserved, Astronomy, History, Lessons of Life, Life, Milestone, Nevada, Religion, Science, Spring, United States

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Christmas, Earth tilt, religion, religious beliefs, religious celebrations, winter season, winter solstice

Winter Solstice:  Annual Test of Survival

The northern hemisphere’s Winter Solstice has had a major impact on civilizations in Europe, Asia, and North America. Early humans on these continents felt the fear and uncertainty as days became shorter and cold limited the availability of food and other life-sustaining resources. Each year the question had to be asked: “Will we survive?”

‘High Noon’ at 39° North latitude in mid-December

Every year, the Sun’s daily crossing sank lower and lower in the southern sky until it slowed and then stopped sinking. After a few weeks, the arc of the Sun began to slowly rise, bringing longer days followed by warmer temperatures. Spring returned and food and resources became more plentiful.

It is easy to understand so many pagan rituals and celebrations in northern cultures occurred near the shortest day of the year. It is also easy to understand why many religions adopted or adapted the solstice pagan rituals as their own. Most notably Christmas was conveniently established on or near the same day as the Roman observances of the season.

…around the time of the winter solstice, Romans observed Juvenalia, a feast honoring the children of Rome…In addition, members of the upper classes often celebrated the birthday of  Mithra, on December 25. Mithra was an ancient Persian [infant] god of light…

History.com 2017

December Winter Solstice: It’s a Upper North Thing

Winter Solstice of the northern hemisphere is a regional phenomenon. People who live between 25° north and 25° south latitude cannot be faulted for feeling that it is a non-event. Their length of day between Summer and Winter is relatively insignificant compared to the drastic changes experienced by people farther north.

For people in the southern hemisphere, our Winter Solstice is their Summer Solstice. In fact, the Earth is closest to the Sun in late December and early January so the dark, cold days of our Winter Solstice are completely contrary to everything they experience at that time of year.

Where the Winter Solstice Shaped Religion

Did the Winter Solstice Reinforce Religious Authority?

Europe and the Middle East civilizations would have felt the impact of the Winter season. Each year people would be faced with ever-worsening conditions, possibly creating life-threatening situations. People who had experienced many solstices may have become oracles of hope by predicting a return to longer days and warmer weather.

The wise predictors of the return of the longer days would have seemed mystical leading to dependence on their guidance in all matters of life. It would be understandable that people who had no concept of how Earth’s seasonal cycles might begin to see an older person as magical when they consistently predicted the end of the cold and shorter days.

Knowledge of the Winter Solstice, cycles of the Moon, and other astronomical cycles would give rise to religious followers who felt their lives might be dependent on the whims and good graces of deities. By the time these religious movements expanded to regions South of the 25th latitude, they were massive social organizations that offered meaning and explanations to life.

South American Cultures Largely Ignored the Solstices

It is noteworthy that Mayan, Incan, and Astec civilizations observed and followed the apparent movement of the Sun, Moon, planets, and stars; however, there was no corresponding celebration or significance to the Winter Solstice in either the northern or southern hemispheres. Astronomy was important in determining the best conditions for planting crops; however, that time was influenced by ideal weather conditions (rainy or dry seasons) rather than a time that would correspond to the Spring planting conditions in the northern hemisphere.

The Reason For the Season

Clearly the northern Winter Solstice does not have a worldwide impact; however, for cultures above 25° North latitude, it has been a vital observance. The Winter Solstice has provided hope and reassurance of better days to come. While northern religions largely ignore the Winter Solstice as having any connection to their winter traditions, there is no doubt that it is the origin of all religious rituals during this time of year.

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