Jewish CosmologyExplore Jewish time through astronomy.

Inverse functions and principal branches

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

פונקציות הפוכות וענפים ראשיים

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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.