Determining the attainability domain of aeroassisted orbital plane change, i.e. the inclination and the longitude of the ascending node, is a very important problem.
Over the course of one orbit we see two such dips, as the first star blocks the second and then half an orbit later when the second passes in front of the first.
One of these errors was the inclination of the ecliptic; the other was the differentiation of the sexes, and the saddest thought about the last was that it should have been so modern.