Matthew Walker quote ✍️

Quote

Back in the 1940s, people were sleeping on average just a little bit over eight hours a night, and now, in the modern age, we're down to around 6.7, 6.8 hours a night.
Section of a curve
?
A
?
R
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C
Hint 1 meaning
The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.
Hint 2 anagram
RAC
Hint 3 another clue
AID WHEN GOING TO COURT
8 +1

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