⍵
{⍵/⍨0.000001>|x-1○○⍵÷180}
⍵/⍨
x a b←⎕ 3⍕{⍵/⍨1E¯6>|x-1○○⍵÷180}a+1E3÷⍨⍳1E3×b-a
…×b-⊃a b x←⎕
{3⍕{⍵/⍨1E¯6>|⎕-1○○⍵÷180}⍺+1E3÷⍨⍳1E3×⍵-⍺}