Take the Andreas Strehler Sauterelle à Lune Perpétuelle 2M, for example. This bad boy is the king of accurate moonphases, keeping perfect time with the moon for over two million years! That's not a typo – two million years. It's all thanks to some seriously clever engineering and a gear ratio that matches the moon's cycle almost perfectly.

It's been officially proven, too, so this isn't just marketing hype. While the Strehler is top dog, other brands like A. Lange & Söhne and De Bethune also make some incredibly precise moonphase watches. These aren't cheap, but they're more than just watches; they're mechanical masterpieces built to last way beyond our lifetimes.