Exact is the moment an aspect reaches its precise angle, with an orb of zero. This is the peak of a transit and the point the whole contact is measured from. Everything this app dates — a window, a pass, a peak — is positioned relative to it. Exact in that strict sense is an instant rather than a band, which is why traditional practice keeps a separate word, partile, for an aspect that merely shares a degree.
A transit is applying before exact and separating after, so exact is the hinge the two halves of the reading turn on rather than the whole of it.
the strongest expression of whatever the contact is.
Saturn square Sun exact on a Tuesday is the day the whole two-week window is named for.
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