Present Values of the Optical Depth as Measured at the CSO

The most recently measured value of 225 GHz optical depth at the CSO is 0.065, at 01:04 UT. Current time is 01:17 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 .