Investigation
Did Earth once have a 360-day year in recorded history?
Challenges
Long-span planetary ephemerides are dynamically consistent with the historical Solar System rather than a recent major shift in Earth's orbital period.
Canonical Source · technical report
The Planetary and Lunar Ephemerides DE430 and DE431
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Evidence context
How this source is used
Evidence roles describe what this source helps establish inside each Investigation. They are local to that use, not permanent labels attached to the publication itself.
Investigation
Did Mars pass catastrophically close to Earth in the 8th–7th century BCE?
Challenges
JPL's long planetary ephemerides provide a dynamically consistent ancient configuration rather than a recent catastrophic Mars-Earth scattering.
Investigation
Did the Exodus occur during a global astronomical catastrophe?
Challenges
A large comet-like planetary encounter would have major dynamical consequences; modern Solar System modeling provides no historical trajectory supporting such an event.
Investigation
Did Venus pass catastrophically close to Earth in recorded history?
Challenges
JPL planetary ephemerides numerically integrate orbits fitted to observations and support a continuous historical planetary configuration rather than a recent Venus-Earth scattering event.
Subject families