Every time I come to Dellys, in between all the visiting and swimming, I find myself marvelling at the full linguistic resources of colloquial Algerian Arabic, and learning new words and constructions; this time is no exception. I've been typing some of these up, and plan to post them on my sporadic Internet visits.
One of my aunts taught me a new Darja term the other night - triq əttbən طريق التبن, the Milky Way, literally the Road of Straw. In the old days before there were clocks, people used to tell a prayer time by it: when it first became visible in the sky, they would go pray `Isha. That test may not work so well in modern city environments, but Dellys is still dark enough at night that you would probably get it about right. She also mentioned nəjmət əl`iša نجمة العشاء and nəjmət əlməġrib مجمة المغرب (the `Isha and Maghrib stars), which would presumably be Venus and Mercury respectively. I'll have to look into the rest of the astronomical terminology sometime, if I can find anyone who knows it.