A few weeks back, a client asked if I could chart Dew Point on a standard graph we produce (showing Temperature and Humidity). I'm pretty sure we can, said I, so I popped over to Wikipedia to find out the pertinent formulae (reasonably complex), added some columns into my spreadsheet to calculate Dew Point, and added the Dew Point to the graphs. I had no idea if they were right at all, I just did the math.

Today, the client and I were talking about the site, and he casually mentioned "I think the software has a checkbox for Dew Point". I checked. Indeed it does. I was too dumb to look.
But the good thing is, I developed this spreadsheet and graph from scratch, and developing my own algorithms. And the result (as seen in the chart) matches the commercially available.
It's nice to get a paper back with a big fat 100% in red ink. Nice to know that I've still got it. At least as far as spreadsheets and math go......
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