The Perihelion Effect

  • 00 Days To Earth Sun Closest Point

perihelion January 4, 2020

Distance vs Velocity over the year

Change in earth’s orbital velocity over 1 year

Actual JPL Ephemera Data

Note the strange bumps in the acceleration near the time of perigee and apsis

 

 

Distance from earth to sun

 

Distance vs Acceleration

60 month extrapolation

 

Range (“delta”) and range-rate (“delta-dot”) of target center with respect
to the observer at the instant light seen by the observer at print-time would
have left the target center (print-time minus down-leg light-time); the
distance traveled by a light ray emanating from the center of the target and
recorded by the observer at print-time. “deldot” is a projection of the
velocity vector along this ray, the light-time-corrected line-of-sight from the
coordinate center, and indicates relative motion. A positive “deldot” means the
target center is moving away from the observer (coordinate center). A negative
“deldot” means the target center is moving toward the observer.
Units: AU and KM/S