Voyager 1 and 2 Notes

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VOYAGER 1 AND VOYAGER 2 PROJECTED DATES AND TIMES:

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Geocentric:

Voyager 1 Light Time reaches 24 hours on  2026-Nov-19-Thu at 02:17 UTC.
Voyager 2 Light Time reaches 24 hours on  2035-Nov-01-Thu at 16:53 UTC.

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Heliocentric:

Voyager 1 = 1 Light Day From Sun        Date: 2027-Feb-04-Thu
Voyager 2 = 1 Light Day From Sun        Date: 2035-Nov-28-Wed

COMPUTED ON AD 2025-OCT-12-SUN  via  THE NASA/JPL HORIZONS API

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These Date/Time values were obtained  by 7-point Lagrangian Interpolation
based on the below Light Times values vs. Julian Dates tabulated at 1-day
intervals at 00:00:00 UTC on each date.

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HOW THE GEOCENTRIC PROJECTIONS WERE COMPUTED:

The following  data was used  to compute the  times when the geocentric
time to the Voyagers would  equate to 24 hours or exactly 1440 minutes.
The heliocentric computations were done in the same manner.

Both Voyagers are headed in different directions at different speeds, so
the dates when they both reach a light or signaltime of 24 hours are widely
separated.  In this case, the difference between the events is some 9 years
even though they are virtually identical spacecraft launched only a few days
apart.

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VOYAGER 1:  Geocentric Distance and Light Time

 Date__(UT)__HR:MN:SS, 1-way_down_LT
 2026-Nov-19 02:15:00  1439.99979447
 2026-Nov-19 02:16:00  1439.99987833
 2026-Nov-19 02:17:00  1439.99996219
 2026-Nov-19 02:18:00  1440.00004604
 2026-Nov-19 02:19:00  1440.00012989
 2026-Nov-19 02:20:00  1440.00021375

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 Light Time = 1440 Minutes (24 Hours)
             at JDUT = 2461363.595452058
           = 2026-Nov-19-Thu at 02:17:27 UTC

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 VOYAGER 2:  Geocentric Distance and Light Time

 Date__(UT)__HR:MN:SS, 1-way_down_LT

 2035-Nov-01 16:51:00, 1439.99974091
 2035-Nov-01 16:52:00, 1439.99986370
 2035-Nov-01 16:53:00, 1439.99998649
 2035-Nov-01 16:54:00, 1440.00010928
 2035-Nov-01 16:55:00, 1440.00023207
 2035-Nov-01 16:56:00, 1440.00035486

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Light Time = 1440 Minutes (24 Hours)
             at JDUT = 2464633.203548626
           = 2035-Nov-01-Thu at 16:53:07 UTC