Moon Illumination percentage?

I am trying to create a tag expression that will show the percentage of illumination for the current moon phase. (see image).I have seen some watch faces published with this expression, but I don’t know if its possible in watch face studio. Could someone please tell me if its possible and, if so, what tag expression to use and the appropriate modification.

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I started this topic . To find it one would do a search . People do not search Forums in my Experience . Let me know what you think . It does not account for all the Cosmic Wobble but it is near enough . I would not us it for Interstellar Navigation .
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Thankyou. I did see that post and manually typed in the tag and it didn’t work. I direct copied and pasted it just now and it works! (I must have typed in wrongly first time).Thankyou for your hard work.

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Yeah Typing that stuff is difficult and it has to be format Protected when it is posted here .
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(numberFormat(“#.#”,(50+((sin(rad((((([MOON_PO])/28))*360)-90)))*50))))