am is "anti meridian" (before crossing of overhead sun). pm is "post meridian" (after crossing of overhead sun).
That is the meaning of am and pm; originating with early astronomers I suppose. Gene. ---- Original message ---- >Date: Mon, 2 Feb 2009 21:24:15 -0000 >From: "Martin Vlietstra" <[email protected]> >Subject: [USMA:42840] Re: Hot and dry >To: "U.S. Metric Association" <[email protected]> >... > > BTW, how many people know how we got "am" and "pm" > (without looking it up)
