More or less dooglus updates the chart for five different BTC/fiat pairs if the BTC price is within the top 100 of days, and for each fiat pair he has a specific exchange that he uses and calulates the price for the day at the closing at midnight UT based on the average price per trading volume for that pair on that day. So each time one of the BTC/fiat pairs is within the top 100 days it gets updated, so you see the USD pair is on bitstamp and yesterday, August 4, it traded at 83rd top day ever for USD/BTC at $10,842.51. If it does not trade in the top 100, it does not make the posted chart, and if none of those BTC/fiat pairs are in the top 100 disciplined dooglus does not tend to post anything in this thread. (hahahahahaha - using the word "disciplined" with all due respect)
But what is the purpose of this exercise? Does it help in one way or the other in trading?
You don't believe people are interested in BTC ATHs in various currencies? Top 100 days is merely a variation of ATH that goes out a bit further.
Personally, I believe that what dooglus is regularly updating provides a good current capture of BTC price when it happens to be in top 100 days but also a good historical record too for anyone interested in such data accuracy concepts. Sometimes you might read some article about bitcoin, and you might be able to confirm quickly in this thread if they are accurately representing the data in their article by comparing it to these top 100 day charts.
Of course, if you are not interested, then you don't need to watch this thread. You must have been drawn to this thread for some reason, no?