The day formula stored for this lot is Ascendant plus the Lot of Fortune minus Mars. Fortune by day is Ascendant plus Moon minus Sun, and substituting gives Ascendant plus Ascendant plus Moon minus Sun minus Mars. The Ascendant does not cancel here. It appears twice, and the lot moves at twice the Ascendant's rate.
That makes the Lot of Courage the most time-sensitive point in this atlas, and one of the most time-sensitive quantities in a horoscope of any kind. The Ascendant advances about one degree every four minutes; two Ascendants advance one degree every two. A birth time wrong by four minutes moves Courage by two degrees, and a birth time wrong by an hour moves it by thirty, a full sign.
The practical instruction follows directly. This lot should not be read at all from a birth time that was remembered rather than recorded. It requires the minute, and where the minute is uncertain the honest report is a range of possible signs rather than a placement.
The doubling also has an interpretive edge. Because the Ascendant enters twice and Mars only once, the lot is driven far more by the moment of birth than by the condition of the planet whose lot it is said to be, which sits oddly with the doctrinal reading of it as the lot of Mars.
Nemesis, built on Fortune in the same way, has the same doubling and the same requirement.