Teja is one of those words that have a meaning in more than one language (which is appealing to me in itself) - some fairly general and others quite specific, ranging from twilight, rainbow, all kinds of radiance - but also clay roof tiles (er, yeah..). Nonetheless, the meaning that I have in mind is from my own language, referring to the light in the sky, that is the result of the sun, but without the sun being visible.