diff --git a/layouts/partials/footer.html b/layouts/partials/footer.html
index 12d7767..07d09bf 100644
--- a/layouts/partials/footer.html
+++ b/layouts/partials/footer.html
@@ -7,6 +7,7 @@
   <span>Theme️ <a href="https://github.com/nanxiaobei/hugo-paper" rel="noopener" target="_blank">Paper</a></span>
 </footer>
 <script src="{{ "highlight.min.js" | absURL }}"></script>
+<script src="{{ "sunrise-sunset.min.js" | absURL }}"></script>
 <script src="{{ "main.js" | absURL }}"></script>
 </body>
 </html>
diff --git a/static/sunrise-sunset.min.js b/static/sunrise-sunset.min.js
new file mode 100644
index 0000000..cefb17b
--- /dev/null
+++ b/static/sunrise-sunset.min.js
@@ -0,0 +1 @@
+var SunriseSunsetJS=function(t){"use strict";var n=90.8333,e=15,a=36e5;function r(t){return Math.sin(2*t*Math.PI/360)}function u(t){return 360*Math.acos(t)/(2*Math.PI)}function i(t){return Math.cos(2*t*Math.PI/360)}function h(t,n){var e=t%n;return e<0?e+n:e}function o(t,n,o,M,c){var f,g,s=function(t){return Math.ceil((t.getTime()-new Date(t.getFullYear(),0,1).getTime())/864e5)}(c),l=n/e,v=o?s+(6-l)/24:s+(18-l)/24,D=.9856*v-3.289,I=h(D+1.916*r(D)+.02*r(2*D)+282.634,360),P=.91764*(f=I,Math.tan(2*f*Math.PI/360));g=h(g=360/(2*Math.PI)*Math.atan(P),360),g+=90*Math.floor(I/90)-90*Math.floor(g/90),g/=e;var S,w=.39782*r(I),T=i((S=w,360*Math.asin(S)/(2*Math.PI))),d=(i(M)-w*r(t))/(T*i(t)),m=h((o?360-u(d):u(d))/e+g-.06571*v-6.622-n/e,24),F=Date.UTC(c.getFullYear(),c.getMonth(),c.getDate());return new Date(F+m*a)}return t.getSunrise=function(t,e){var a=arguments.length>2&&void 0!==arguments[2]?arguments[2]:new Date;return o(t,e,!0,n,a)},t.getSunset=function(t,e){var a=arguments.length>2&&void 0!==arguments[2]?arguments[2]:new Date;return o(t,e,!1,n,a)},t}({});