When will all the planets be in conjunction as viewed from the Earth or the Sun?

That kind of forecast is beyond what can do with my limited resources and time. My ephemeris shows no such configuration before the year 2020. However, in the year 2020 there are several interesting conjunctions among the planets which means an unusually busy year between January - March... even more so than May, 2000 AD.

Conjunction            Date                 Sky Separation
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Mercury - Saturn      January 21           2 degrees
Venus - Neptune       January 27           5 arcminutes !!!!!!
Jupiter - Saturn      March 18             4 degrees
Mars - Jupiter        March 20            43 arcminute 
Mercury - Venus       March 22            54 arcminutes
Mars - Saturn         March 31            55 arcminutes
Mercury -  Neptune    April 3              1 degree
Mercury - Uranus      May 1               19 arcminutes
Mars - Neptune        June 21             1.5 degrees
Jupiter - Saturn      December 21          6 arcminutes !!!!!

Copyright 1997 Dr. Sten Odenwald
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