The year 2005 marks the 600th anniversary of Zheng He's first voyage to the Western Seas. The great Spanish navigator Columbus made his first ocean voyage in 1492. How many years are there between the two ocean voyages?
2005年是中国伟大航海家郑和首次下西洋600周年，西班牙伟大航海家歌伦布首次远洋航行是在1492年．问这两次远洋航行相差多少年？
<gadget id="calculator">2_005 - 600</gadget>
<output>1_405</output>

<gadget id="calculator">1_492 - 1_405</gadget>
<output>87</output>

<result>87</result>