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Milestones

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Indeed, the Hindu holy book - of course there are many,
but I think if asked to name one, most Hindus regard the Gita as the book.
Oppenheimer slightly misquoted XI.32, Sri Krishna says
'ka:lo'smi loka-kshaya-krit pravriddho
loka:n-sama:mhartum iha pravrittah'
'I have become time, the mighty world-destroyer
now busy wiping out the world'
A little later, Arjuna responds by declaring Krishna to comprise all the Hindu pantheon,
naming all the main deities, including including Yama, the God of Death.
It goes to show, however, the kind of Renaissance men that many Physicists were in the 20th century, that J. Robert was aware enough to quote the Gita twice, even if freely.
दिवि सूर्यसहस्रस्य भवेद्युगपदुत्थिता।

यदि भाः सदृशी सा स्याद्भासस्तस्य महात्मनः।।॥११–१२॥
 
As you know, I can't quote physics, quite out of my depth.
I think there was a lot of interest in Hindu philosophy, especially Vedanta, among intellectuals in those days,
rather as there is in Buddhism now - and of course there are close parallels at the philosophical level.
 
As you know, I can't quote physics, quite out of my depth.
I think there was a lot of interest in Hindu philosophy, especially Vedanta, among intellectuals in those days,
rather as there is in Buddhism now - and of course there are close parallels at the philosophical level.
Arguably, some of that interest was fueled by a number of outstanding Physicist/Mathematicians from India, such as Nobel prize-winning, Subrahmanyan Chandrasekhar, FRS, whose calculation of The Chandrasekhar limit (when he was only 20) laid the foundation for our understanding of the creation of the heavier elements in exploding supernovas and thus the source of life on earth.
 
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Chandrasekhar’s work centered on the most basic question of his time in Physics and Astronomy – how does a large star survive.
The core reaction of conversion of Hydrogen in Helium by fusion had been deduced at the fuel of stars, providing the energy for the light. The process was ignited by the enormous pressure and temperature from the gravitational weight of the outer layers of the star. However, an important question remained. What happened when this fuel, hydrogen, ran out? Would the star slowly and quietly cool to a ball of cold gas (a dark dwarf, it was called)? That was the assumption. Continuing work started by Wilhelm Anderson and E. C. Stoner in 1929, Chandrasekhar, in 1930, at the age of twenty, made a calculation which, it is no exaggeration to say, revolutionized our understanding of stars.

Using advanced concepts of Einsteinian Relativity and Fermi degeneracy, Chandrasekhar calculated that any star with more than 1.4 times the mass of our sun, could not be supported by electron degeneracy pressure. That is, the gravitation weight of that mass of star could not be held up by any force known to science.

To step back a little. A star like the Sun is subject to incredible gravitational force driving it to compress further. This is prevented by the explosive force and heat from the central nuclear fires of fusion as mentioned above. This energy may be visualized as follows: 1,820,000,000 Tsar Bombas – the most powerful thermonuclear bomb ever built -per second!

This is all well and good, but like any furnace, the Sun will eventually run out of fuel. Then what happens? The traditional answer was the pressure of electron degeneracy. This is a fancy, Physics way, of saying that matter refuses to be pressed beyond a certain density. This resistance is provided by the electrons stubbornly holding to their quantum orbits around the nuclei.

Fine and Dandy. Then along comes Chandrasekhar. He calculates, that once a star, larger than 1.4 Suns, runs out of nuclear fuel, the electron orbit integrity is insufficient to resist the weight of the outer layers. This leads to a startling conclusion. Such a star must shrink forever, into zero diameter!

That is a lot of lecture. If anyone’s interested, I will add a post showing where this led Astronomers (to things like Supernovas, Neutron stars, Black holes, and how we have a planet that supports life.)
 
Just recalled, it is 150 years since the start of the Franco Prussian war, an event whose effects still are felt today.
Next year will bet the 150th anniversary of the final act of the Franco Prussian war, the Fall of the Commune, an event which actually did not involve the Prussians at all!
They just stood by and watched while the french slaughtered each other!

https://www.britannica.com/event/Commune-of-Paris-1871
It is actually today 150 yeras ago, July 19th 1870, that France declared war on Prussia.

Lured into a diplomatic trap, set up by Bismarck, who wanted to elminate France, as a threat aginst German unification, and rally the south German states behind that cause.

France had gambled, that the south German states would stay aside. They did not and went to war too. So France's army was facing a much stronger opponent, than anticipated.

Weaponry was comparable, but the German army was better organised, and their commanders did not eschew casualties. Von Bredow's cavalry death ride at Mars-la-Tour, the charge of the guard brigade at Saint-Privat (8000 men fell in 20 minutes)….

French resistance was harsh, they fought every street, every house, to the last bullet, like in Bazeilles. French civilians, Franc-tiruers, ambushed the Germans, resulting into harsh retaliation.

After a month of hevay combat in August, the French aemies were trapped in Metz. A new army was raised to relieve Metz. The Emperor himslef joined his troops. It got encircled at Sedan and surrendered on September 2nd. Emperor Napoleon III was taken prisoner. In Paris, the Third Republic was proclaimed.

The Germans marched on and besieged Paris. Bismarck proclaimed King Wilhelm of Prussia, to emperor of Germany, in the Versailles palace (January 18th 1871). Ten days later, Paris surrendered. Soon, an armistice was closed and peace negotiations began.

Social and political unrest in Paris, due to the standstill of economy during the siege, resulted in March in a revolt, known as the Commune de Paris. Germany stayed aside and permitted the French to crush the revolt, which had radicalized more and more. During the ‘Bloody Week’ (21-28 May 1871), thousands of insurgents were killed in combat or executed on the spot.

Peace was made in the Treaty of Frankfurt. German troops would occupy France until war damages were paid, which was accomplished within a few years. Bismarck had achieved his major political goal to bring all German states into a Prussia controlled empire. He had not intended to start a war of conquest, but nevertheless, Germany would seize the largely German speaking territory of Alsace-Lorraine. France lost cities like Strasbourg, Metz and Mulhouse, and its cherished Rhine border. The loss of Alsace-Lorraine would fuel an intense spirit of revenge in France. For more than forty years, they had to watch, with chagrin from their new border, the distant ‘Ligne bleue des Vosges’, the blue rim of the Vosges mountains, now under enemy control.

Finally, in 1914, the moment of revenge came. French troops crossed the border, with an exalting offensive spirit… just to get mowed down by machine gun fire. Only after the German defeat, in 1919, Alsace-Lorraine was restored to France.
 
It is actually today 150 yeras ago, July 19th 1870, that France declared war on Prussia.

Lured into a diplomatic trap, set up by Bismarck, who wanted to elminate France, as a threat aginst German unification, and rally the south German states behind that cause.

France had gambled, that the south German states would stay aside. They did not and went to war too. So France's army was facing a much stronger opponent, than anticipated.

Weaponry was comparable, but the German army was better organised, and their commanders did not eschew casualties. Von Bredow's cavalry death ride at Mars-la-Tour, the charge of the guard brigade at Saint-Privat (8000 men fell in 20 minutes)….

French resistance was harsh, they fought every street, every house, to the last bullet, like in Bazeilles. French civilians, Franc-tiruers, ambushed the Germans, resulting into harsh retaliation.

After a month of hevay combat in August, the French aemies were trapped in Metz. A new army was raised to relieve Metz. The Emperor himslef joined his troops. It got encircled at Sedan and surrendered on September 2nd. Emperor Napoleon III was taken prisoner. In Paris, the Third Republic was proclaimed.

The Germans marched on and besieged Paris. Bismarck proclaimed King Wilhelm of Prussia, to emperor of Germany, in the Versailles palace (January 18th 1871). Ten days later, Paris surrendered. Soon, an armistice was closed and peace negotiations began.

Social and political unrest in Paris, due to the standstill of economy during the siege, resulted in March in a revolt, known as the Commune de Paris. Germany stayed aside and permitted the French to crush the revolt, which had radicalized more and more. During the ‘Bloody Week’ (21-28 May 1871), thousands of insurgents were killed in combat or executed on the spot.

Peace was made in the Treaty of Frankfurt. German troops would occupy France until war damages were paid, which was accomplished within a few years. Bismarck had achieved his major political goal to bring all German states into a Prussia controlled empire. He had not intended to start a war of conquest, but nevertheless, Germany would seize the largely German speaking territory of Alsace-Lorraine. France lost cities like Strasbourg, Metz and Mulhouse, and its cherished Rhine border. The loss of Alsace-Lorraine would fuel an intense spirit of revenge in France. For more than forty years, they had to watch, with chagrin from their new border, the distant ‘Ligne bleue des Vosges’, the blue rim of the Vosges mountains, now under enemy control.

Finally, in 1914, the moment of revenge came. French troops crossed the border, with an exalting offensive spirit… just to get mowed down by machine gun fire. Only after the German defeat, in 1919, Alsace-Lorraine was restored to France.
And the echos still reverberate even now!
 
So on July 20, 1969 at 20:17 Coordinated Universal Time (or Greenwich Mean TIme for Traditionalists) Apollo 11 touched down on the Moon


I watched it from my sick bed, chicken pox or measles I don't remember which now. It was interesting but they played it all day, and cancelled the Bugs Bunny show and others that I would normally have watched! I still have an educational pack that someone gave me at the time, with cardboard models of the rocket, the lander, fact sheets and all sorts of bits and pieces.

And where have we gone since, 51 years later? Nowhere :(

C'mon Elon, get a move on!

I'm having enough trouble with GMT..

G = gin
T = tonic
I'm not sure what the M is for, Tree?
 
25th July 1920: Rosalind Franklin born. While best-known for her vital contribution to the discovery of the structure of DNA, and for the disgracefully shabby way she was treated (especially after her tragically early death) by the men involved in that breakthrough, at least equally important was her work on the chemical structure and workings of viruses - what could be more topical?

 
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Andrea Doria 26 July 1956.jpg

Off the coast of Nantucket, the Italian liner, Andrea Doria lists to starboard after being fatally wounded in a collision with the Swedish liner, Stockholm. The collision occurred in dense fog at 11.10 pm on 25 July 1956, despite the use of radar by both vessels. Stockholm's ice-breaking bow penetrated Andrea Doria's hull to a depth of 40 feet, breaking the keel, opening seven decks to the sea and compromising her watertight subdivision. The list could not be corrected and prevented the port side lifeboats from being launched. The starboard lifeboats could only accommodate 1044 of the 1706 souls aboard.

Having established that their ship was not sinking, Stockholm's crew put their boats in the water to assist in the evacuation of the Italian liner. The ships communicated by radio, and other vessels raced to the scene, including the US Navy Transport, Private William H. Thomas and the French Line flagship, Ile de France, which also deployed lifeboats and played a notable part in the rescue. Andrea Doria remained afloat for eleven hours, eventually capsizing and sinking at 10.00 am the following day. The scene was flown over by news teams and for the first time the world witnessed a major shipwreck drama unfolding live on television.

46 people died as a direct consequence of the collision, which resulted from the poor use of technology by the crews of both ships involved. Each vessel had been tracking the other by radar, but their intended courses were misinterpreted. In the aftermath, reforms included an obligation by shipping lines to improve radar training, to make radio contact directly with any approaching vessel and always to make a starboard turn to avoid a collision.

Andrea Doria has since claimed further lives - over the past 64 years at least twenty-two scuba divers have lost their lives diving on the wreck, which lies at a challenging depth of over 160 feet. Stockholm was repaired and continued to sail until being extensively rebuilt in 1993, emerging as the cruise liner, Astoria. At 72 years old, she is now the oldest ocean liner in service. In common with the rest of the world's cruising fleets, she was laid up in Tilbury in March 2020, as a result of the Coronavirus pandemic.
 
rebuilt in 1993, emerging as the cruise liner, Astoria. At 72 years old, she is now the oldest ocean liner in service. In common with the rest of the world's cruising fleets, she was laid up in Tilbury in March 2020, as a result of the Coronavirus pandemic.
....and the company operating her has gone bust because of the pandemic, so her future is uncertain.
 
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