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Ground track

A ground track is the path traced on Earth's surface directly beneath a satellite as it orbits.

Because the planet rotates under the orbit, each successive pass shifts westward, drawing the familiar sine-wave pattern on a flat map.

The track's north–south extent is set by the orbit's inclination, and repeating ground tracks are designed for satellites that must revisit the same places.

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Related terms

  • Orbital inclinationOrbital inclination is the angle between a satellite's orbital plane and Earth's equator, measured in degrees.
  • RAAN & the ascending nodeThe ascending node is where a satellite crosses the equator heading north; RAAN (right ascension of the ascending node) is the angle that fixes that crossing point in space.
  • Orbital periodThe orbital period is the time a satellite takes to complete one full orbit, set almost entirely by its altitude.

All space terms

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