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PLANETAI

CLOCK → EPHEMERIS → TRAJECTORY → WORLD

Window

Atlas V launching Mars 2020 Perseverance from Cape Canaveral, 30 July 2020.
NASA / JPL-Caltech · PIA23989 · DOCUMENTARY IMAGE30 July 2020, 11:50 UTC. A calculated departure, not a blessing.
SunEarth now30 July 2020Mars later18 February 2021transfer · 203 daysleave too soon · missLeave when the chord matches the travel time.
One relationship: two moving clocks and a travel time. NASA/JPL Perseverance dates. Orbits drawn circular and coplanar. Schematic. Not to scale.
  1. Watch a light so that something might happen.
  2. Calculate where Mars will be. Window 17 July to 15 August 2020.
  3. Leave Earth, 30 July 2020, 11:50 UTC.
  4. Meet Mars, 18 February 2021.

The continuity is attention to moving worlds. The epistemology is different: a launch window is geometry, not a blessing.

Red WorldRetrograde motion, then maps, then an engineering destination whose future place can be calculated.

EveDoor

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