Precession

Precession is the slowly tolling movement of the earth ax, caused by influence of Sun and Moon.

Consequences of precession

Caused by precession actual positions of celestial objects will be different from the positions when an old observation system was built.  This made relations between stone formations and celestial objects are difficult to examine. Astronomers use complex computer software for that kind of calculations...

Changing angle of declination

Also the position of the points of sunrise and sunset are changing by precession. Earth's declination angle (angle equator) changes slowly. In fact sunset isn't showing yearly on exact the same point. Per century the change of the azimuth (point of sunrise) is about 0.02 degrees, or a shift about 0.2 degrees per 1000 year. So megalith builders saw sunrise about one degree more north than we do.
Source: Sun, moon and standing stones - John Edwin Wood

Declination angles: (According to J.E.Wood)

Time era

In consequence precession we see other stars on a specific moment (for example on spring-equinox) than a few thousand years ago. The zodiac seems to shift slowly across the firmament.

Today spring-equinox stands in the constellation Pisces. Cause of the sunshine the constellation isn't visible on that specific moment. We can see Pisces during night in autumn.
So we still are living in the Age of Pisces, and still need patience for "The Age of Aquarius'...

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