historical comet observations in China
... that historical comet observations in China as far back as 12 BC have been used to study changes in the brightness of Halley's Comet?
... that <b id="mwBnA"><a href="./Historical_comet_observations_in_China" id="mwBnE" rel="mw:WikiLink" title="Historical comet observations in China">historical comet observations in China</a></b> as far back as 12 BC have been used to study changes in the brightness of <a href="./Halley's_Comet" id="mwBnI" rel="mw:WikiLink" title="Halley's Comet">Halley's Comet</a>?