The citation graph
Which judgment cites which, and what it said while citing. Three questions: what a judgment rests on, who has relied on it since, and whether anyone has departed from it.
Where the edges come from
A citation becomes an edge only where the citing court publishes its citations as data, or the text of the judgment has been read for them. A court with judgments but no edges has not been read yet.
Most relied upon
Ranked by how many distinct judgments cite them. One judgment citing the same authority nine times counts once.
Departures
Where a judgment said it was leaving an earlier one behind. This is the list that stops you citing dead law.
No departure has been recorded.
Departure is not detected yet, and the gap is deliberate. Searching for the words the Court might use was measured on 1,019 judgments: "depart from" appears 100 times and most often means departing from the facts found by a domestic court; "overruled" appears 44 times, usually about a domestic judgment; "abandon" appears 123 times, most often as abandoned firearms. Tightened to require the Court itself as the subject, precision was still around 40%, the rest being a dissenting judge complaining, or a national supreme court departing from its own case-law. Telling a lawyer an authority is dead when it is alive is worse than saying nothing, so nothing is what this says until each candidate can be judged properly.