2 words containing XAN 16-letter words

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16 letters (2)

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
ACR
Hint 3 another clue
AID WHEN GOING TO COURT
15 +2

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