What is the api for the astrology web site and what are the parameters that are supported by the api?
Once you know that, you can use the Web component to query for the information that you need.
Appending the values entered by the user to the url which is passed to the api may be as simple as using the Text join block
Telling the app to get the result may be as simple as including a Web Get block and GotText block.
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sf