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Full Idea
Natural necessity involves causal directionality as an essential element, while entailment as a purely logical relation does not.
Gist of Idea
If explanation is by entailment, that lacks a causal direction, unlike natural necessity
Source
Harré,R./Madden,E.H. (Causal Powers [1975], 7.V)
Book Ref
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.134
A Reaction
If there is a naturally necessary relation between an eclipse and its cause, the directionality of that doesn't seem to arise from the mutual relation between the two. You have to add time's arrow, or causation's arrow.
Related Idea
Idea 15294 Powers can explain the direction of causality, and make it a natural necessity [Harré/Madden]
| 17077 | The height of a flagpole could be fixed by its angle of shadow, but that would be very unusual [Smart] |
| 17078 | Universe expansion explains the red shift, but not vice versa [Smart] |
| 15293 | If explanation is by entailment, that lacks a causal direction, unlike natural necessity [Harré/Madden] |
| 15294 | Powers can explain the direction of causality, and make it a natural necessity [Harré/Madden] |
| 17092 | An explanation needs the world to have an appropriate structure [Ruben] |
| 8968 | If the flagpole causally explains the shadow, the shadow cannot explain the flagpole [Lowe] |