/moon

/moon

Shows the current moon phase (New, Waxing Crescent, Full, etc.), percent illumination, and how many days into the ~29.5-day lunar cycle we currently are.

Usage: just /moon — no arguments needed, it’s the same answer for everyone regardless of location (moon phase doesn’t depend on where you are on Earth).

Also tells you whether tonight favors deep-sky observing (darker skies near New Moon) or is better suited to lunar/planetary viewing (brighter skies near Full Moon wash out faint objects).