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Orbital Mechanics

Ecliptic Plane Planetary Orbits Space Exploration Planetary Movements Polar Orbits Elliptical Orbits Extreme Orbits Gravitational Influence Gravitational Effects Planetary Visibility Milankovitch Cycles Mission Planning Illusions in Astronomy

Tonight: Crescent Moon Sits Between Venus and Jupiter in the Western Twilight

The eye-catching grouping previews a much tighter Venus–Jupiter conjunction expected in early June.

Mars’ Gravity Helps Drive Earth’s Ice‑Age Cycles, New Simulations Show

Newly Cataloged Extreme Trans-Neptunian Object Challenges Planet Nine Hypothesis