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Saturday, 22 Iyyar, 5786
  |  May 9, 2026

Cheder Chabad Monsey Takes a Crack at Science

Do dinosaurs exist? Rabbi Yechiel Krisch, a lecturer on the intersection between science, technology, medicine, and authentic Judaism, posed a challenge to students of Cheder Chabad of Monsey’s mechina division. Full Story, Video

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Wow
April 3, 2024 7:17 pm

A jem to the world. These boys are very lucky to be sitting in his presence let alone to be taught by rabbi krish.

Wow
April 4, 2024 8:04 am

Yay for the cheider and hurray for Rabbi Krisch.
Dirah lo Yisborach bepoiel mamosh.
Bringing MOSHIACH NOW!

May I bring up a science topic for discussion?
April 4, 2024 11:00 am

There is the famous question: “Does the sun revolve around the earth or vice-versa?” The Rebbe’s famous view on that is that according to Einstein’s theory of relativity, scientifically, you cannot tell one from the other. But, was this observation lost on the astronomers, centuries before, who concluded that the earth revolves around the sun? In the 15th century, renowned astronomer, Nicolaus Copernicus, who by the way, was a religious man, was bothered by the the accepted notion at the time, that the other planetary bodies, including the sun, revolve around the earth. This was because, if the other bodies… Read more »

The old way to answer this is:
Reply to  May I bring up a science topic for discussion?
April 4, 2024 6:02 pm

For this reason the Greeks said that there are mini spheres (galgalim) within the 9 spheres. (This was brought in this weeks Rambam).
Copernicus came up with a different answer to this question.

Did the Greeks, or even Rambam, observe this?
Reply to  The old way to answer this is:
April 5, 2024 11:28 am

But, did they have anything to say about the RETROGRADE affect?
This was the “proof” that the earth revolves around the sun in a yearly cycle. This is the accepted view today.

See this video of Rabbi Jacobson on the subject, where I also
posted this question:

https://www.theyeshiva.net/jewish/7621/rambam-mishneh-torah-15-rambam-hilchos-yesodei-hatorah-chapter-3

A simple google search
Reply to  Did the Greeks, or even Rambam, observe this?
April 6, 2024 4:01 pm

In the geocentric model of the Solar System proposed by Apollonius in the third century BCE, retrograde motion was explained by having the planets travel in deferents and epicycles.

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