diff --git a/templates/index.html b/templates/index.html
index 126934f..5d9311b 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -57,7 +57,7 @@
             
             <p>参数说明：</p>
             <ul>
-                <li class="parameter"><strong>$\theta_0$</strong>：$2\pi(n-1)/365$，单位为弧度</li>
+                <li class="parameter"><strong>$\theta_0$</strong>：$2\pi(n-1)/365.2422$，单位为弧度</li>
                 <li class="parameter"><strong>$d_n$</strong>：一年中的日期序数，0, 1, 2, ..., 364</li>
             </ul>
           </div>