First recorded <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Perihelion" id="mwGg" rel="mw:WikiLink" title="Perihelion">perihelion</a> passage of <a href="https://en.wikipedia.org/wiki/Halley's_Comet" id="mwGw" rel="mw:WikiLink" title="Halley's Comet">Halley's Comet</a>.<sup about="#mwt20" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-2"}}' id="cite_ref-2" rel="dc:references" typeof="mw:Extension/ref"><a href="./May_25#cite_note-2" id="mwHA" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text" id="mwHQ">[2]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-2"><cite about="#mwt17" class="citation book cs1" id="CITEREFJonathan_Powell2017">Jonathan Powell (17 April 2017). <a class="external text" href="https://books.google.com/books?id=0ISuDgAAQBAJ&amp;pg=PA51" id="mwBxw" rel="mw:ExtLink nofollow"><i id="mwBx0">Cosmic Debris: What It Is and What We Can Do About It</i></a>. Springer. p.<span id="mwBx4" typeof="mw:Entity"> </span>51. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBx8" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwByA" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-3-319-51016-3" id="mwByE" rel="mw:WikiLink" title="Special:BookSources/978-3-319-51016-3"><bdi id="mwByI">978-3-319-51016-3</bdi></a>.</cite><span about="#mwt17" class="Z3988" id="mwByM" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Cosmic+Debris%3A+What+It+Is+and+What+We+Can+Do+About+It&amp;rft.pages=51&amp;rft.pub=Springer&amp;rft.date=2017-04-17&amp;rft.isbn=978-3-319-51016-3&amp;rft.au=Jonathan+Powell&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D0ISuDgAAQBAJ%26pg%3DPA51&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMay+25"></span></span>