Is this on-line? Deborah Houlding has an essay at Skyscript on the order of the planets but how or why the terms got started escapes me. In contrast, the faces were a big simplification of the Egyptian decans that got Hellenized.
Not likely. And even less likely that it will be in English. If you're really interested send me a PM. I'll dig it up for you and give you the cliff notes.
I sometimes look at septiles (360/7) in a chart, and then I wonder how the 7th harmonic is interpreted in a Vedic system.
The D-7 chart is used for questions about children. It's basically an extension of the 5th house (or the 5th house on a higher level of reality). And in vedic astrology you can read a divisional chart like a normal chart, with dignities and aspects and such. However, if the question were about when someone will have children, you would normally just look at the 5th house and the 1st house (Lagna) of the D-7 chart and see what its rulers are and if there are any planets in those houses and what their conditions are.
But it is important to keep in mind that since the D-7 chart is a derived chart, it doesn't stand for itself, it has to be seen in the context of several other charts, namely the natal chart, the Moon chart (natal chart with Moon as ASC) and the Navamsa (D-9). So you basically look at (at least!) 4 different charts simultaneously if there's a pattern that is being repeated in all or at least in a couple of those charts.
It's a rather laborious endeavor but then again, if you do it the original traditional western way with all the different rulers for the 5th house, its lots and almuten, it's actually a similar procedure.