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This guy is truly a long-term thinker. (And fast. I came here to post about Precession of the Equinoxes, but found he had already done so.)

Dang. I was wrong. The Gregorian calendar (our calendar) corrects for both the non-integral number of days in the sidereal year _and_ for axial precession. I.e., it keeps the solecist, but not perihelion, on (mostly) the same day. In AD 15,000, perihelion, but not summer solstice, will be in July.

Maybe the effect somehow affects just the time within the day of solstice when the sun ray aligns.. Someone should run a detailled geometrical Simulation, would be interesting.

That makes sense, our calendars just being adapted to these effects.

The alignment would only depend on Earth’s axial tilt which currently is 23.4°. 5,000 years ago it was 24.0° and in 5,000 it will be 22.9° which seem well within engineering tolerances for a neolithic structure. en.wikipedia.org/wiki/Eclipti...

Where are their Gantt charts?

Even if any of the above were true, the monument still stands as a magnificent testament to their expertise and dedication.

it was live-streamed this morning- low key heart stopping

Particularly good designing considering there must be only about 1 year in 20 or 30 when the sunrise is visible on the winter solstice; on the overwhelming majority of winter solstices, it'll be cloudy on the horizon at sunrise. How did they determine the day when it is cloudy for weeks on end?