bigcliff

Hi all, first post so be gentle with me. I'm trying to understand what the tracking in the following URL portion means. The URL is from position 27 on page 2 on a search on Amazon. /ref=sr_1_27?ie=UTF8&qid=1386759643&sr=8-27&keywords= I think the 1386759643 is a timestamp I think the 2 x sr= mean search result = The 27 obviously means position 27 in the search results but what does the 1 in ref=sr_1_27 & the 8 in sr=8-27 mean and why are there 2 different =sr's? Thanks in advance