Subject	solar eclipse
Predicate	occur on
Object	rare occasions
Modality	Modality Occurrences some[subj/solar and lunar eclipses occur on rare occasion] 2
Polarity	POSITIVE
Plausibility	0.9216
Neighborhood Sigma	0.9216
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source solar and lunar eclipses occur on rare occasions 4 Google Autocomplete, Answers.com Questions