update README

ct-chu · Jun 3, 2024 · 7a563a0 · 7a563a0
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 This is a online interactive version of the planisphere from HKNEAC.
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+The production copy is [here](http://www.hokoon.edu.hk/planisphere/)
+Live Demo on [Github Page](https://ct-chu.github.io/planisphere/)  
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 ## Functionality implemented
 
 1. View the constellations in the night sky of a specific date and time of the year.