How to find it - click on item "Stargazing Report: Sealing Stone" which you can find in "Obtained From" under the knowledge description. At the bottom of item page is tab called "Can be obtained from". Here you can find NPC which gives the knowledge.
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Anonymous 26-03-2017 00:24
Thanks!
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Anonymous 3-09-2017 00:04
IDK if it was changed but it's gained from Walagala not Zahad. Also I recommend people check out the building Manmehan Nesser is in as there is a ton of knowledge and I'm pretty sure you can get get most if not all Horoscope knowledge without having to do amity.