Dear Francois,

>I can't find what is wrong... Is it t0 (3 january 1950) ? is it w ?
>For w, I use :
>
>       w = 101┬░13'15" + 6189".T
>with T the number of days ( from the 1 january 1900 at 0h ) divided by
>365.25.
>

I think your problem is the definition of T.  The longitude of perihelion 
increases very slowly -- by less than 2 degrees per century.  So it should be 
defined as the number of days from 1 Jan 1900 divided by 36525 days (instead of 
365.25 days).

Otherwise your method seems okay.

Best regards,

Roger Sinnott
Sky & Telescope


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