An orbit passing near both geographic poles of its central body. Planetary rotation brings different longitudes beneath successive passes, useful for global remote sensing; one satellite still samples each location intermittently.
An orbit whose nodal precession tracks the central planet's annual motion, keeping approximately the same local solar time at corresponding crossings. Near-Earth implementations are nearly polar and exploit the planet's nonspherical gravitational field. Fixed local-time sampling supports comparison between passes while limiting observations of the diurnal cycle.
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A polar orbit is a type of orbit in which a satellite passes over the Earth's poles. In this orbit, the satellite travels in a north-south direction, allowing it to observe or image the entire surface of the Earth over time as the planet rotates beneath it. This type of orbit is particularly useful for Earth observation, reconnaissance, and environmental monitoring because it enables satellites to cover every part of the Earth with regular revisits.