The most recently measured value of 225 GHz optical depth at the CSO is 0.169, at 22:37 UT. Current time is 04:11 UT.
The 350 micron tipper is currently offline.
If you'd like to see plots of tau vs. time and/or tau cumulative distribution functions by quarter and by month, click here.
For a short explanation of the tau sky monitor instrumentation click here .