VisuApps
Grasp celestial mechanics, the night sky and spaceflight
Apps
Horizon and meridian fixed, the celestial sphere turns about the axis tilted to the latitude, the sun runs along the ecliptic. Choose date, time and place: day arc, day length, noon altitude and declination update live — the seasons come from the tilt, not the distance. Exhibit-ready.
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Today's Sun from NASA's SDO in ten channels — from white light with sunspots through the chromosphere to the million-degree corona and flare plasma. Outward slider, layer cross-section, compare with blending, rotation time-lapse, live sunspot number and X-ray flux.
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6,360 confirmed exoplanets as a 3D point cloud around the Sun — coloured by discovery method or temperature, with a time travel since 1995. The Earth-like filter reveals how strongly discovery methods bias the catalogue: 32 worlds remain, almost all around red dwarfs.
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Space itself stretches: from every galaxy all others recede (switch observer), measure the Hubble diagram yourself, light is stretched and reddened on its way. Time slider from the early universe into the future, a(t) with dark energy.
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Two black holes orbit, merge and ring down: spacetime ripples as a spiral, the chirp signal h(t) runs live, a ring of test masses squeezes. GW150914 as preset, signal to listen to, exaggeration shown.
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Hertzsprung–Russell diagram with two stars of equal age: mass decides luminosity, lifetime and fate. Red giant, planetary nebula, supernova, neutron star or black hole; colour computed from temperature.
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Compare a 3D scene with the view from Earth. Understand changing lunar phases and distinguish them from the Earth’s shadow during a lunar eclipse.
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A real night sky based on the Yale Bright Star Catalog — over 40,000 stars, 35 constellations with lines, Milky Way glow along the galactic plane, drag-to-rotate and telescope zoom.
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The James Webb Space Telescope as 108 named parts in six assemblies (NASA CAD model). The slider takes it apart: the sunshield unfolds into five layers, the primary mirror into 18 segments — every part with its name and job.
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More than 14,000 real satellites orbit the Earth live (CelesTrak orbital elements, SGP4) — time-lapse, filters by group, altitude and launch year, orbit and values for every object. Why the ISS needs 93 minutes and the GEO ring turns with the Earth.
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Real-time ray tracing of a Schwarzschild black hole: the far side of the accretion disk appears as an arc above the shadow, and the shadow is 2.6 times the size of the horizon. With a no-curvature comparison, masses from 10 M☉ to M87*, and a falling probe that freezes at the horizon.
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Eight planets on real elliptical orbits — Kepler's equation solved numerically, speed via slider from days to years per second.
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100,000 stars at their true positions in space. From the Sun they form the familiar constellations — a sideways flight breaks them into stars hundreds of light-years apart. Orion alone spans from 26 to 1,977 light-years.
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Explore Earth’s rotation, orbit and tilted axis. Compare daylight length, solar elevation and distance to understand why seasons are not caused by solar proximity.
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