Kiddush HaChodesh
TorahInteractive
Two skies, one motion
An orrery that moves between the sun-centred sky, the earth-centred sky, and the Rambam's nine nested galgalim — with the sun and moon driven by the Rambam's own figures from Hilchot Kiddush HaChodesh.
Text & translation
Hilchot Kiddush HaChodesh
The Rambam's laws of the new month in Hebrew with a new English translation alongside, chapter by chapter.