1) Light-second = 300,000,000 meters
The first tree is at 1 (light-microsecond), the second is at 2 L|uS(I used routinely, 1 |uS range gate for 150 meters-round trip in Radar maths)
2) 4.2 X 10^ -4 degrees = 1.512 seconds of arc
Distance = 1/1.512" = 0.661376 parsecs
= 0.661376 X 3.26 LY =...