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3D Diagrams on Rambam Kiddush haChodesh, Lesson 5

Chapter 17: The Arc of Sighting

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Kiddush haChodesh, Lesson 5: Chapter 17: The Arc of Sighting

Related Text: Kiddush HaChodesh - Chapter Seventeen
קידוש החודש - פרק יז
Topics: Kiddush Hachodesh
By Mendel Deren
Rabbi Mendel Deren is director of Chabad of the Cardo in Jerusalem, Israel.
Courtesy of Chabad of the Cardo - Jerusalem, Israel.
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max ordlen winetca illinois May 29, 2024

It is really amazing how you take such complex thing that even Maomonidies himself said it is only ordained smart people and that the Raavad said it is too complex (on rambam kidush hachodesh chapter 7). You have made the hard in to the simple the complex to clear you must be smarter than Solomon. Reply

Yehoshua Buenos Aires, Argentina January 3, 2022

Thank you for the interesting and instructive video.

I was wondering ... since all elements are made of a composition of: earth, water, air and fire.

1) Is it correct to say that the sun is made of by the vast majority of fire? i "think" it is mainly made of fire and not totally ... otherwise how is it a luminary and not a light?

2) According to 1). What is the main component of the moon? ... if it were "earth", why does it not fall either to the sun or earth? if it were "earth", what moves it? As i understand only "celestial bodies" like stars can move in a circular motion in the atmosphere ... while here in the earth, fire moves upwards and when it reaches the atmosphere it begins its orbit in circles?

I would appreciate a response with citations if possible. Thanks, Reply

Ricardo Porto Alegre May 30, 2024
in response to Yehoshua:

I am not trying to be disrespectful. haShem created an extremely complex world full of incredible marvels, and if we want to fully appreciate the amazing beauty of the creation, we need to study it seriously. Lots of people studied year and years to come up with these answers.

1. The best evidence shows that the sun is composed by 71% hydrogen, 27% helium, and 2% heavier elements. It weights 330,000 times the mass of the earth. It shines bright because in its core nuclear fusion is occurring, converting hydrogen atoms into helium. Every second 620 million metric tons of hydrogen are being converted into 616 million metric tons of helium and the difference in mass produces 3800000000000000000 billion watts of energy. And that is not even close to the biggest starts that haShem have created.

2. The moon is a big rock, like the Earth. It doesn't fall because its speed spinning fast around us keeps it in equilibrium, just like a communications satellite, just much bigger and farther. Reply

Yackov Yitzchak Kaufer Awtsmoos עצמות May 4, 2025
in response to Ricardo:

B"H
Some human science experiments have made artificial suns that are hotter than the core of our sun. Pretty intense Reply

Ben NYC January 20, 2021

what program are you using? Reply

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