Assertion: mercury's transit | /r/HasProperty | infrequent
Facets:
Source sentences:
text: He suggested that no transits had been observed either because planets such as Mercury were too small to see, or because the transits were too infrequent.
text: For both Mercury and Venus, he suggested that no transits had been observed because the planet was either too small to see or because the transits are too infrequent.