Assembling the Sun, Earth & Moonβ¦
π Sun Β· Earth Β· Moon
live Β· loadingβ¦
Locationβ
Local timeβ
Sunβ
Moon phaseβ
In constellationβ
Directionβ
Altitudeβ
Distanceβ
Next moonriseβ
waning gibbous
π General Relativity live Β· exact
Gravity as flowing space and slowing time β computed live.
River of space β inflow v = β(2GM/r)
at Earth's surfaceβ
at the Moon's orbitβ
into the Sun @ 1 AUβ
Time dilation dΟ/dt = β(1β2GM/rcΒ²)
Sun's well @ 1 AUβ
Earth's own wellβ
surface clock losesβ
Curvature checks
rs Sun Β· Earthβ
light bend @ Sun limbβ
Scene clocks & ray-bending are exaggerated for visibility;
the numbers above are real.
π Andromeda (M31)
Nearest major galaxy Β· 2.54 million ly Β· ~1 trillion stars.
(dwarf satellites of the Milky Way are closer)
How we know the distance β standard candles
Cepheid V1 β Hubble's variable star. A Cepheid's pulsation
period fixes its true luminosity (Leavitt law) β distance.
SN 1885A β S Andromedae, a Type Ia "standardizable" candle.
Cepheids β Type Ia SNe β Hubble's law: the rungs of the
cosmic distance ladder.
β± Time
Drag to orbit Β· scroll to zoom Β· right-drag to pan.
β Sun
π Earth
π Moon
π Mysore
π Andromeda Β· 2.54 Mly
β¦ Cepheid V1
β¦ SN 1885A (Type Ia)