Planetary Alignment: A Rare Conjunction (2D)

Time

Fast-forward speed 200 days/s

"Aligned" means within

Angular tolerance 30°

Planets included (as seen from Earth)

Live Readouts

Epoch

J2000.0 + 0 d

Sky spread (from Earth)

0.0°

Visible conjunction?

—

Heliocentric spread

0.0°

Max plane deviation

0.0°

Top-down view: the outer ring is Earth's zodiac — each tick is where a planet's sightline (from Earth, dashed) crosses it, which is what "planets align in the sky" really means. The dotted orbits use the true relative periods from Kepler's third law (T ∝ a^1.5). A true 3D syzygy also needs every orbit's tilt (inclination) to line up, tracked separately in "max plane deviation" — click a planet to inspect it, drag to pan, scroll/pinch to zoom.

t = 0 d