Anomaly

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Anomaly

An unusual or unrepeatable event. For example, a stock index inexplicably rising 20% in a week during a bear market may constitute an anomaly.
References in periodicals archive ?
After one Saros, the Moon's mean anomaly decreases by only 2.
Arguments [omega] and l' are the mean longitude of the lunar ascending node and mean anomaly of the Sun, respectively.
For example: the altitude of a celestial body is identified as a on page 209 but h on page 489, while the Sun's mean anomaly is alternately g (page 42), M (page 44), and G (page 484).

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