At what local (mean solar) time is the vernal equinox at its upper culmination three weeks after the autumnal equinox?

On the day of the autumnal equinox, the vernal equinox culminates at exactly midnight (0 hours). Each day it culminates about 4 minutes earlier than the previous one. Consequently, in three weeks the culmination will occur at 0 o’clock – 4⋅21 minutes, or at 22 hours 36 minutes.

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