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 …
Understanding the Eccentricity of the Earth’s Orbit and Its Impact on Timekeeping Timekeeping has been an essential aspect of human civilization since ancient times. The use of sundials to measure time has been prevalent for centuries, but did you know that the eccentricity of the Earth’s orbit affects the accuracy of sundials and other timekeeping …
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Earth at Perihelion On January 4, 2001, our planet made its annual closest approach to the Sun.Listen to this story (requires RealPlayer) January 4, 2001 — This morning at 5 o’clock Eastern Standard time (0900 UT) Earth made its annual closest approach to the Sun — an event astronomers call perihelion. Northerners shouldn’t expect any relief from the …