Units

• Angular measure
  • 1 arcsec = 1/1800 solar diameter = headlights@120 miles
  • 1 millisecond of arc = 0.001 arcsec

• Distance
  • 1 mile = 1.61 km
  • 1 km = 0.61 mile
  • 1 AU = earth's orbital semiaxis major = 1.5 10(8) km
  • 1 parsec = 3.2616 ly = 206265 AU = 3.09 10(13) km

• Mass
  • solar (S) = 1.0 = 2 10(33) gm
  • Jupiter (J) = 2 10(30) gm = 0.001 solar mass
  • Earth (E) = 318 J

• Temperature
  • 1000 deg Kelvin = 2323 deg F.

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