<a href="https://en.wikipedia.org/wiki/Apollo_program" id="mwAXo" rel="mw:WikiLink" title="Apollo program">Apollo program</a>: <i id="mwAXs"><a href="https://en.wikipedia.org/wiki/Apollo_8" id="mwAXw" rel="mw:WikiLink" title="Apollo 8">Apollo 8</a></i> performs the first successful <a href="https://en.wikipedia.org/wiki/Trans-Earth_injection" id="mwAX0" rel="mw:WikiLink" title="Trans-Earth injection">Trans-Earth injection</a> (TEI) maneuver, sending the crew and spacecraft on a trajectory back to <a href="https://en.wikipedia.org/wiki/Earth" id="mwAX4" rel="mw:WikiLink" title="Earth">Earth</a> from <a href="https://en.wikipedia.org/wiki/Lunar_orbit" id="mwAX8" rel="mw:WikiLink" title="Lunar orbit">Lunar orbit</a>.<sup about="#mwt201" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-38"}}' id="cite_ref-38" rel="dc:references" typeof="mw:Extension/ref"><a href="./December_25#cite_note-38" id="mwAYA" style="counter-reset: mw-Ref 38;"><span class="mw-reflink-text" id="mwAYE">[38]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-38"><cite about="#mwt198" class="citation book cs1" id="CITEREFOrloff2000">Orloff, Richard W. (2000). <a class="external text" href="https://books.google.com/books?id=U1QgAAAAIAAJ" id="mwCag" rel="mw:ExtLink nofollow"><i id="mwCak">Apollo by the Numbers</i></a>. <a href="./NASA" id="mwCao" rel="mw:WikiLink" title="NASA">National Aeronautics and Space Administration</a>. p.<span id="mwCas" typeof="mw:Entity"> </span>39. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwCaw" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwCa0" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780160506314" id="mwCa4" rel="mw:WikiLink" title="Special:BookSources/9780160506314"><bdi id="mwCa8">9780160506314</bdi></a>.</cite><span about="#mwt198" class="Z3988" id="mwCbA" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Apollo+by+the+Numbers&amp;rft.pages=39&amp;rft.pub=National+Aeronautics+and+Space+Administration&amp;rft.date=2000&amp;rft.isbn=9780160506314&amp;rft.aulast=Orloff&amp;rft.aufirst=Richard+W.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DU1QgAAAAIAAJ&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ADecember+25"></span></span>