It's now five hours later and still only one sale but the ranking has changed. Someone might find this info useful 
Amazon Best Sellers Rank: #201,552 Paid in Kindle Store

Amazon Best Sellers Rank: #201,552 Paid in Kindle Store
I just thought that it might be useful to show the figures because with a new book and only one sale it's easy to see what is happening with the ranking.Edward W. Robertson said:Yeah, with a just-published title, it can take several hours after its first sale for its rank to start showing up. It's kind of interesting to watch the rank (and know the sales numbers) of a new title. They have to sell a lot more to achieve a given rank than books that have a sales history behind them, and they lose rank really quickly.