太阳同步轨道：修订间差异

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 * [http://www.centennialofflight.net/essay/Dictionary/SUN_SYNCH_ORBIT/DI155.htm Sun-Synchronous Orbit dictionary entry], from U.S. Centennial of Flight Commission
 * [http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970613a.html NASA Q&A]
-* {{cite web|url=http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/37901/1/04-0327.pdf|title=The A-B-Cs of Sun Synchronous Orbit Design|publisher=Space Flight Mechanics Conference|first=Ronald J.|last=Boain|date=February 2004||||access-date=2011-05-27}}
+* {{cite web|url=http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/37901/1/04-0327.pdf|title=The A-B-Cs of Sun Synchronous Orbit Design|publisher=Space Flight Mechanics Conference|first=Ronald J.|last=Boain|date=2004-02||||access-date=2011-05-27}}
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