I did not know that! Thanks (interesting+useful for in-planning book project on all this)
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Replying to @jonathanglick
Prayers clearly. Tied to sun for daily, moon phases for week-month, and to both for seasonal (solstices etc)
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Replying to @jonathanglick
Yeah but less frequent can be sun-indexed: sunrise, sunset, noon give you 3 points
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