Quote:
Originally Posted by robko
And in further explanation to what AnemicOak said, they represent "virtual" page numbers which are, roughly speaking, based on 1024 characters. I say roughly speaking because apparently it is technically more complex than this due to compression and other factors. Those numbers will be in the same place on any given reader (although apparently they can vary slightly between brands due to factors mentioned above) so even at different font sizes you can find the same point. It is also why on some readers depending on font size you may change several screen pages before the page number if displayed at the bottom of a page changes. Some readers may use the number of screen pages as the page number but increasing or decreasing the font size changes the number of pages and what page number a passage may appear on.
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Read about it in our Wiki:
Adobe_Digital_Editions#Page_numbers
I don't believe compression would mess around with the offsets, and I don't know what other factors you refer to.
Usually Adobe page numbers are held up as a paragon of consistency.
Quote:
Originally Posted by robko
Probably because a "page" can (and often does) start/finish somewhere other than the bottom of the screen it's displayed on. The number on the side of the line let's you know where the "page" actually starts. As most readers do give you the option to turn off the numbers but not all, there also are likely some that don't give you page number at top or bottom of a screen so you'd have no way of knowing what page you were on.
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What is a page, anyway?
I always know exactly where I am in a book, but not-really-page-numbers if anything merely muddy the waters.