Quote:
Originally Posted by kovidgoyal
lines per screen = number of pixels in the physical screen in the vertical direction/number of pixels per line in the vertical direction
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I think the OP is talking about the page numbers AdobeDE uses to delimit the text rather than pages as "screens full of text".
If so, check out Adobe's "EPUB Best Practices Guide," most recent version available in EPUB format from their
Digital Publishing Technology website. It's the one place I've seen discussed Adobe's EPUB-extension "page map" facility, which lets you provide an explicit mapping of where AdobeDE determines numbered page boundaries to be.