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This is the most useful message this site can receive, and it is taken seriously. Three things make it quick to act on:

• the page address
• the figure shown, copied exactly
• what you expected instead, and where that comes from if you have a source

Dates described as “today” are computed in US Eastern Time, which is named on every page that uses one — worth checking first if a day count looks one out and you are not on the east coast. How everything else is worked out, and the measured accuracy of the sun and moon times, is on the about page.

Security reports go to the same address. There is a security.txt at the usual place.