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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, Date_________JDUT, , , 1-way_down_LT
2026-Nov-17 00:00:00, 2461361.500000000, , , 1439.74276855
2026-Nov-18 00:00:00, 2461362.500000000, , , 1439.86657188
2026-Nov-19 00:00:00, 2461363.500000000, , , 1439.98846530
2026-Nov-20 00:00:00, 2461364.500000000, , , 1440.10843736
2026-Nov-21 00:00:00, 2461365.500000000, , , 1440.22647741
2026-Nov-22 00:00:00, 2461366.500000000, , , 1440.34257554
2026-Nov-23 00:00:00, 2461367.500000000, , , 1440.45672244

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Derived Lagrangian Interpolation Table 1:

  Light_Time  vs   JDate
1439.74276855    2461361.5
1439.86657188    2461362.5
1439.98846530    2461363.5
1440.10843736    2461364.5
1440.22647741    2461365.5
1440.34257554    2461366.5
1440.45672244    2461367.5

Light Time = 1440 Minutes (24 Hours)
             at JDUT = 2461363.595452058
           = 2026-Nov-19-Thu at 02:17:27.058 UTC

=================================================================
VOYAGER 2:  Geocentric Distance and Light Time

Date__(UT)__HR:MN:SS, Date_________JDUT, , , 1-way_down_LT
2035-Oct-30 00:00:00, 2464630.500000000, , , 1439.51994751
2035-Oct-31 00:00:00, 2464631.500000000, , , 1439.69796512
2035-Nov-01 00:00:00, 2464632.500000000, , , 1439.87545799
2035-Nov-02 00:00:00, 2464633.500000000, , , 1440.05239208
2035-Nov-03 00:00:00, 2464634.500000000, , , 1440.22873372
2035-Nov-04 00:00:00, 2464635.500000000, , , 1440.40444970
2035-Nov-05 00:00:00, 2464636.500000000, , , 1440.57950730

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Derived Lagrangian Interpolation Table 2:

  Light_Time  vs   JDate
1439.51994751    2464630.5
1439.69796512    2464631.5
1439.87545799    2464632.5
1440.05239208    2464633.5
1440.22873372    2464634.5
1440.40444970    2464635.5
1440.57950730    2464636.5

Light Time = 1440 Minutes (24 Hours)
             at JDUT = 2464633.203548626
           = 2035-Nov-01-Thu at 16:53:06.601 UTC