Jewish CosmologyExplore Jewish time through astronomy.

Double, triple and multiple angles

Manipulate the construction, compare measurements and follow the derivation. שנו את הבנייה, השוו מדידות ועקבו אחר ההוכחה.

זוויות כפולות ומשולשות

Unlock this animation

One-time payment · ILS 50.00 for the full animation library.

Browse the animation library

Spherical geometry

Watch the sides and angles of a spherical triangle change together.

Calculus

Follow the tangent as it moves along a curve.

Interpolation

Compare estimates between known points on a curve.

The observer’s sky

See the Sun and stars cross the dome above Jerusalem.

The sky in 360°

Watch the same sky from a fixed viewpoint as daylight comes and goes.

Rambam’s nine galgalim

See the nested spheres and their shared daily motion around Earth.