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Channels Torah Classes Hilchos Kiddush HaChodesh Animations

3D Diagrams on Rambam Kiddush haChodesh, Lesson 1

Introduction

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Kiddush haChodesh, Lesson 1: Introduction

Related Text: Mishneh Torah (Rambam): Kiddush HaChodesh - Chapter 11
Topics: Kiddush Hachodesh
Kiddush Hachodesh
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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Zalman Mayer June 1, 2026

How can I download this video Reply

Chabad.org Staff June 1, 2026
in response to Zalman Mayer:

This video cannot be downloaded at this time. Reply

Mendel Deren Israel June 1, 2026
in response to Zalman Mayer:

Go to my You Tube channel Mendel Deren and take it from there. Reply

samy jorbel Denver, Colorodo May 30, 2024

Are these degrees farenheight or celcius? Reply

josh nigz May 28, 2024

Amazing shuir huge vort!! Reply

David Smirnoff March 29, 2023

What is this software called ? Reply

Ricardo Telichevesky Porto Alegre, Brazil November 20, 2022

Of course the calculations of Rambam are a lot more difficult due to the model that puts the Earth at the center, instead of the Sun. No one can blame the brilliant Rabbi though, because these facts only became known a few centuries after his death, and in those days even suggesting such a thing could be a death sentence as in Giordano Bruno's case (well he said other things that were frowned upon in those days too). I don't want to start a fight here about this - obviously one can use any reference point - either Earth at the center, or the Sun at the Center - if you really want to make things difficult for yourself you can put the Moon at the Center too. Just think about it GPS is very widely used and puts the Earth at the center because it makes things easier. I was just curious if anyone tried to redo his magnificent work using this 'new' information - obviously would achieve exactly the same results without that much pain - in that case, would you have a reference? Thanks Reply

Dan A October 29, 2023
in response to Ricardo Telichevesky:

The Rambam wrote with Ruach Hakodesh. There was no mistake Reply

Mendel Chicago May 4, 2025
in response to Ricardo Telichevesky:

According to Torah the earth is in the middle. it doesn't matter if it would be easier to calculate with the sun in the middle because it's wrong! Reply

Ricardo Telichevesky Miami, FL October 29, 2023
in response to Dan A:

I didn't say it was a mistake. I said there is an easier way of doing the calculation. If done right, should achieve the very same results as the Rambam, of course. Reply

Rafi Rosenberg Skylake, FL July 22, 2022

This is absolutely amazing!!! You are a great teacher and the animated illustration is so helpful! Thanks for your efforts! Reply

kopel detroit May 2, 2025
in response to Rafi Rosenberg:

you are indeed very good at explaining what the Rambam said with newer technology I'm sure the Rebbe and the Rambam have much
nachas from you Reply

Levi Y Rapoport Syracuse April 4, 2018

Correction @ 5:13 mark: Each constellation contains 30 degrees (not 60). Reply

Eldad October 11, 2017

how do i get this application ? Reply

Ben May 16, 2021
in response to Eldad:

i also want it. Reply