At the top are the buttons to edit and save the current rule, as well as the fields containing information about the text, symbols and images that represent the current rule.

The middle part of the rule editor contains the Required and Exclusions tabs. Within each tab, selected values in a group are alternatives, while active groups are combined by intersecting their matching time intervals. The rule keeps the Required intervals after subtracting the combined Exclusions intervals. The Exclusions groups do not each have to be false: an interval is excluded when their combined conditions match. Full-day expansion and empty selections are described in the options topic below.

More details about the options that make up a Moon Rule can be found here.

Finally, the bottom part of the Moon Lore Rule Editor dialog displays a human readable version of all the options set on the 2 tabs of the middle section. This summary of the current Moon Lore rule is updated immediately as soon as one of the tabs' options is modified.