Remind the missus of Stonehendge. Its plinths seem random, but they are very deliberate and precisly located mathematical and navigational devices.
Those three markers where painstakenly located and aligned. Their accuracy to locating and measuring angles and objects in unsurpassed by any device available to amature astronomers. With your mathematical genius, you can use these "simple" three markers to calculate astronomical movements of the Moon, Planets, Sun and Stars for the next 100 years (longer if you wanted to live that long, but let the next genration work it out for themselves!).
If she believes this rant, then quickly hit her with your intention of purchasing a 16" SCT and a fully automated obs in the backyard.

If you don't do it now, you never will.