Antiquarian, the moon image is not easily explained but I think Virgil can explain that better than I can. I did just recently read commentary that the moon to Lawrence represented a coldness and a whiteness and perhaps death. Remember, at this time Lawrence was going through a dire period in his life, having just lost his mother and also lost the woman he was close to...don't think he had relationships with all the women at one time. No, to the contrary; in fact Lawrence very much believed in being married to one woman for life. Of course, in his youth he was struggling to find the right woman, and going through what most of us go through as youths. Therefore it looks like he was a real womanizer but in truth he was not to my eyes.
Anyway, back to the moon, he may have seen the moon in cold terms and the morning star as a favorable omen. So when the moon is mentioned "He says the moon has set, and the evening star," he answered, "Both were out as I came down." The only thing I can make from this, is that the two combined made him hasten to her house or pursue her....he would see the star as the omen saying it was permissable or would be something he should pursue. Because in the next line she says
This indicates that she understood what he was implying. Now I hope we can further understand just what that meant as well. I think that Virgil will have a thing of two to say about the moon. There was a chapter in "Women in Love" that was named "Moony". I will would excerpt some of those passage except it might be a spoiler for you to read the novel. Maybe I will go look the commentary up in the thread that deals with that chapter and the one dealing with 'the morning star'...both would be good resources to examine in relation to this story.