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to find sun aphelion and perihelion using NAIF tool

 from webgeocalc DistanceFinder


Aphelion of 2023:

2023-07-06 20:06:38.435260 UTC

similarly, periphelion of 2023:

2023-01-04 16:17:27.532134 UTC

IMCCE:

slowest orbital speed is on aphelion? de-mythstified: 
According to Kepler's laws, AMS >> Yes. 


But by observation >> Sort of:
10 July in 2023(sqrt(dx^2+dy^2)): IERS
dx:


dy:

60135 is modified Julian date, Keisan 

Solar Distance can be found by JPL SSD, reading AD (Apoapsis distance) column, time is in TDB


 

Reference:

IMCCE perihelion 2023

IMCCE aphelion 2023 

earthscience stackexchange and python script( less than 15 sec of deviation) 

Jay Tanner PHP

GSFC Earth fact sheet

Better than 1 minute resolution , UTC2TDB online convertor
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