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An interesting point from a tour of the Parkes Radio Telescope was that the surface of the land rises and falls with the moon forming land tides.
The land rises 1 metre in height when the moon is overhead.
I don't know if that could possibly be a factor (probably not) but its interesting.
We have had a wet last 6 months compared to previous dry years. The most likely thing.
Luckily its not much work to check your polar alignment from time to time with T-point.
Greg.
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