Visualizations
See the mathematics move
The five-angle clockFive rings turn live: each limb is an angle divided by its span.
The Moon’s necklace27 beads of 13°20′ and the live Moon. Tap a bead.
Living SkyConstellations from real star positions. Scrub time and watch each tithi form.
The Venus rose8 Earth years ≈ 13 Venus years: a five-petalled rose.
The shadow stickLatitude = arctan(equinox noon shadow ÷ 12). Try your city.
The slow wobble50.3″ a year, one turn in 25,800 years: why Sankranti drifts.
Wheels of TimeThe calendar’s cycles, from one day out to a whole yuga, in one zoom.
The oldest sky, recomputedWhere the Vedanga Jyotisha put the solstice, worked out again with the engine.
Architects of the skyAryabhata to Madhava: six astronomers, and a calculation of each one’s to try.
