W
whit3rd
Guest
On Tuesday, October 20, 2015 at 10:56:30 PM UTC-7, Bill Sloman wrote:
Already there: it's Luna. Just A/B compare the brightness of the reflection off the
undisturbed solar-illuminated lunar surface with any conveniently located astral light source. Do
it at night
Seriously, photosphere temperature and disc size are easily measured, and the
Stefan-Boltzman radiation law is well established; solar measurements are routine.
On Wednesday, October 21, 2015 at 10:21:11 AM UTC+11, gray_wolf wrote:
On 10/19/2015 10:41 PM, Bill Sloman wrote:
Technically speaking, the surface of the sun isn't getting any brighter, but the sun is getting bigger, so there's more surface to irradiate us, and more light hitting us.
How would you measure the difference? Would the W/M^2 on the earth's surface
increase?
You'd probably measure the difference by putting a radiometer in orbit.
Already there: it's Luna. Just A/B compare the brightness of the reflection off the
undisturbed solar-illuminated lunar surface with any conveniently located astral light source. Do
it at night
Seriously, photosphere temperature and disc size are easily measured, and the
Stefan-Boltzman radiation law is well established; solar measurements are routine.