<page_title> Halley's Comet </page_title> <section_title> Apparitions </section_title> <table> <cell> 837 <col_header> Year BC/AD </col_header> </cell> <cell> 0.03 AU <col_header> Closest approach </col_header> </cell> </table>
In 837, Halley's Comet passed as close as 0.03 AU from Earth, as its closest approach.