Two Days Per Sign

The Moon crosses the whole zodiac in about 27.3 days. Divide that by twelve signs and you get roughly 2.3 days each, so a new lunar sign arrives before most weeks are out. That speed is why the Moon's CURRENT position is read as weather — the mood of a passing stretch of time — even though its position at your birth is read as character.

Each sign is 30 degrees of the circle. The Moon covers about 13 degrees a day, so it clears one sign in a little over two. That motion is the Moon's own orbit around us, seen from the inside — closer than anything else in the chart, and quicker for it.

Set that against the slow end. The Sun takes about a month per sign; Saturn takes nearly two and a half years, so everyone born across a stretch of years carries it in the same place. A body that slow can only describe something shared. A body that changes twice a week can describe today.

Two useful consequences. Watch your own three-day stretches: the Moon's sign changes inside them, and the shift is usually easier to feel than to argue about. And because it moves roughly half a degree an hour, a birth time off by a few hours can land your Moon in the next sign if you were born near a boundary.

So the transiting Moon is the shortest-lived thing in the sky, and it is honest about that. Read it for the day you are standing in. Your birth Moon is a different question, and it does not move.