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Latitudes with no set or rise of moon/sun

Using an 0° apparent altitude (quiet dependent on this), a date of around 3000 BCE, upper rim of sun/moon and latitudes rounded to nearest degree, we get the following latitudes (using these calculations) where sun/moon is always just above (summer time) or below (winter time) the horizon:

Latitudes with 90° difference in moon/sun azimuth

Using the same apparent altitude at both altitudes, a date of around 3000 BCE, upper rim of sun/moon and latitudes rounded to nearest degree, we get the following latitudes (using these calculations) where there is a difference of 90°:

Conclusion


Green: no set or rise around 3000 BCE
Purple: 90° difference in azimuth around 3000 BCE
Blue: Regions with megalithic monuments (Ginkel [1988])

What you can deduct from the above tables, is that around 3000 BCE between 50° and 63° almost every 2° something like a 90° azimuth difference and/or no set or rise event happens. Most no set or rise events happen outside regions with megalithic monuments, except for the Shetlands (althought altitude can change this per site!).
Assuming that megalithic people did perhaps not bother about accuracy's better than 1°, I think it will be very difficult (using only the above information) to proof that buildings have been specially build at these specific latitudes.


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Last major content related changes: May 12, 2001