Stepping down 0.5 -> 0.1 -> 0.05 -> 0.01 -> ... for the sun rings isn't linear in the log values, if you want to decrease by factors of magnitude. Instead, going 0.3 -> 0.1 -> 0.03 -> 0.01 -> 0.003 -> ... steps down by nearly 1/2 power of 10.
It sounds smart enough to trust imo. Though I'll wait for 
spikeyxxx to affirm 👀
Brent, Martin Finnucane (for some reason tagging doesn't work) is correct.
'Logarithmic linear decrease' (a bit of a weird wording, but okay) can be acchieved by dividing by the same number each step.
Like in dB, each time you reduce the dB by 10 (take a step of magnitude 10 down), you half the volume (divide by 2).
Music was my first encounter with logarithm, I think...It's not math, it's music!
