Measuring the Sun
Once you know the distance to the Sun
(AU), you can convert its apparent size to a true size. Kepler/Newton can give
you its mass (and thus density), and you can convert its observed brightness
to an intrinsic
luminosity once you know how far it is.
Distance
= 1.5x108 km
Mass
= 3.3x105 Earth masses = 2x1030 kg
Density
= 1.41 gm/cc
Temperature
= 5800K (at surface)
Luminosity
= 3.8x1026 watts
