Expanding the Concept As shown above, a wave includes other points besides conjunctions (and even more points beside the quadurate alignments depicted here. More on those points appears in another portion of Measuring History). To itemize these in context of a wave, they appear in this work in two different ways. 1915Saturn-180-Pluto1946 shows the opposition (180º) of the 1915Saturn-Pluto1946. But since most do not always know when the opposition occurred it may also appear 1915Saturn-180-Pluto1946: 1930 so as to pinpoint when the opposition appeared during a wave, obviously 1930 in this case. Because this latter use seems a bit clumsy, it will appear in a more as an introductory function.