The explanation of this seeming anomaly is to be found in the primitive destination of the " animals " to the purposes of an " horary zodiac."
Seven of the twenty days constituting the Aztec month bore names evidently borrowed from those of the Chinese horary signs.
In horary astrology, which provides answers to specific queries, the 2nd House deals with ' lost ' items.
This is an event chart but it can be read in the same way as a horary chart.
I was surprised to find Olivia Barclay was so effusive about Ebertin & midpoints etc in her book ' Horary Astrology Rediscovered ' .