Mm accurate custom guides placement.

Question

How do you move custom guides 1 mm at a time? Can you enter X & Y coordinates?
Command - Drag doesn't work on guides only on objects...!.

Answer 1

http://www.macworld.com/article/59035/2007/07/pagesruler.html
Precisely position items on Pages' ruler
Jul 20, 2007 9:00 am
by Rob Griffiths, Macworld.com
"If you’re a Pages user, you may be somewhat frustrated by some apparent limitations in the way the page-layout application’s ruler works. When you drag a tab stop on the ruler, it moves in full steps between each tick mark on the ruler. But what if you want more precision? It turns out you can precisely place your tab stops by holding down the Command key before dragging—you’ll have absolute control over their positioning ... To give fine control over the position of either the tab stop or the left margin, hold down the Command key in addition to the Option key before dragging. As far as I can tell (via searches on Command and Option in the Pages’ User Manual), these modifier key behaviors aren’t documented."
The question, as always, is which points is Apple using? 72pts = 1 inch (DTP points) or 72.27pts = 1 inch the USA industry measure?
The default co-ordinate system of Xerox Interpress was international metric from the start.
The default co-ordinate system of Apple QuickDraw was 72 points to the US inch with start at upper left.
The default co-ordinate system of Adobe PostScript was 72 points to the US inch with start at lower left.
The default co-ordinate system for the Adobe Portable Document Format, derived from Adobe PostScript language level 2, is identical to that of Adobe PostScript.
I'm not sure, but would be willing to bet that the default co-ordinate system of ISO-IEC 10180 Standard Page Description language is international metric.
I'm not sure, and would not be willing to bet, whether the default co-ordinate system of Microsoft XPS XML Paper Specification is international metric or national US point/inch.
Personally since nothing else is in points except font size, which is a rubbery concept, it is an awful measure to have to use.
Andrew Boag, Monotype Special Projects Manager in the first half of the nineteen-nineties, has a part of the technical history. In the nineteen-seventies, DIN in Germany and BS in the UK standardised an international metric model for x-height and cap height. Andrew points out that Apple and Adobe could have chosen to follow the international metric trend, but instead chose to follow the national US trend towards points and inches in order to appear to address a professional segment in their home US markets in the nineteen-eighties. This, then, is why students in school throughout the European Union have to work with a point and inch system in product purchased from Apple - and of course in product purchased from Adobe.
Best wishes,
Henrik Holmegaard
technical writer, mag.scient.soc.