Assertion: comet | /r/HasProperty | sign
Facets:
Source sentences:
text: Throughout history, comets have been seen as omens; a sign that something was going to happen.
text: The comet was named after Biela, although there was initially some controversy due to a later but independent discovery by Jean-Félix Adolphe Gambart, who also provided the first mathematical proof linking the 1826 and 1805 comets (letters from Biela and Gambart were published in the same issue of the Astronomische Nachrichten).