In "Embers of Moonlight", the Moon goes from being a grand, shining ivory figure to crumbling into a pile of shimmering dust. This progression is shown throughout the poem, as the moon becomes see-through and faded. This process depicts the moon dying as a part of the Night of Rebirth.
At the beginning of the story, the speaker tells us that the moon was sitting on her roof. The moon is personified as a woman with an ivory dress. She is patient, with willowy arms and legs and a pallid luminescence. However, after the speaker closes her eyes and opens them again, the moon appears to have a wrinkly face. Her arms are full of veins. Finally, the moon starts to dim. She is only a fading image towards the end.
Hale denounces the proceedings because it is clear that the girls are not telling the truth in their testimony. To denounce something is to explain why you disagree with it.