Gongji huán
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C:\xiao\1.R1
C:\xiao\2.R1
C:\xiao\3.R1
C:\xiao\4.R1
C:\xiao\5.R1
C:\xiao\6.R1
C:\xiao\7.R1
C:\xiao\8.R1
C:\xiao\9.R1
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Gongji.xy

90 stars in core/2.5=36
36*10000=360000
sqrt(360000/pi)=338.5 radi inner core

340 radi inner core+240 width of gap=580
580*580*pi=1056831.8
1056831.8/10000=105.7
105.68*2.5=264.2 hypothetical stars

288-90=198
198+264=462
462/2.5=184.8
184.8*10000=1848000
sqrt(1848000/pi)=766.97 radi outer ring

1600ly^2 to 400pixel^2
340/4=85
580/4=145
768/4=192

ms paint doesn't follow directions very well
199-192=8
192*2=385

199-146=54
146*2=293

199-85=115
85*2=171

2000ly^2 to 400pixel^2
338.5/5=68
(338.5+238.5)/5=115
766.97/5=153