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That does not mean distance learning is a failure.

Upon his return there was now enough information for the French astronomer Joseph Lalande to calculate that the mean distance from the Earth to the Sun was a little over 150 million kilometers.

By feel, I mean distance control: the ability to look at a putt, make a few practice strokes, and then put the right amount of hit on it.

The authority, in its defense, points out that the current rate remains a staggering improvement from 1981, when the mean distance between failures was 7,000 miles.

Ms. Hakim said the reliability of trains, known as mean distance between failure, had dropped because it had reached an artificially high level when a large order of new subway cars arrived in 2010.