Hi there,
To quote the Cyber Nations Information Index at:
https://www.cybernations.net/about_topics.asp#Moon_&_Mars_Wonders
"One of the key concepts behind the Moon and Mars wonders is that of a position on the Moon and Mars that provides premium solar and resource utilization known as a hidden hotspot that affects the effectiveness of Moon or Mars facilities in the game. The closer in miles that a facility is to the hotspot the more effective that wonder becomes for your nation up to a maximum of 100% and a minimum of 50%."
Basically, there's a hotspot, which is an ideal location for your Moon Wonders, and if your Wonders are too far from the hotspot, they lose up to half their effectiveness.
Case in point, I just moved my Colony to the hotspot, and my colony population jumped from 8,813 to 17,627 so from 50% effectiveness to 100% effectiveness.
The location of the hotspot changes each month. See the discussion thread at https://forums.cybernations.net/topic/64843-moon-hotspot/
to find the latest hotspot.
To pinpoint the coordinates when you're moving your Wonder, try the steps listed at https://forums.cybernations.net/topic/64843-moon-hotspot/page/3/?tab=comments#comment-1806043
under How to set your exact coordinates...