On 2019-03-22 01:15, Georg Dr. Fischer wrote:
It may be an old joke for you, but I did not know that pi seconds are almost a nanocentury. - cf. < https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement>.
I.e., In[120]:= UnitConvert[Quantity[Pi, "Seconds"], "Nanocenturies"] Out[120]= Quantity[(1250000π)/3944619, "Nanocenturies"] In[121]:= N@% Out[121]= Quantity[0.995531080945268, "Nanocenturies"] Slightly more accurate: In[122]:= UnitConvert[Quantity[10^7 Pi, "Seconds"], "Years"] Out[122]= Quantity[(625π)/1971, "Years"] In[123]:= N@% Out[123]= Quantity[0.996192495430553, "Years"] But Mathematiica's sense of humor does not extend to UnitConvert[Quantity[Pi, "Decamegaseconds"], "Years"]: Quantity::unkunit: Unable to interpret unit specification Decamegaseconds. And In[127]:= UnitConvert[Quantity[Pi, "Decimegaseconds"], "Years"] Out[127]= Quantity[π/36500000, "Years"] is just weird. We'll have to settle for In[126]:= UnitConvert[Quantity[10 Pi, "Megaseconds"], "Years"] Out[126]= Quantity[(625 π)/1971, "Years"] —rwg