Their name must surely be legion, although I can think of only a couple at the moment.
Here's one that might be appropriate for the longest day.
"The darkest hour is just before dawn"
This comes of course from a song called "This is dedicated to the one I love" by 1960's West Coast minstrels, The Mamas and the Papas.
As the diagram above shows, the deepest shadow will actually occur more or less equidistantly between dusk and dawn, and the hour before dawn will generally see things start to lighten a little.
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