A blood moon? It's just a trick of the light... there's no astronomical significance to it, it just means that a total lunar eclipse has occurred.

[He know something about astronomy, might even feel affection for the field as one who has pursued a different path but has still sown a childhood dream that has failed to sprout. His brows raise under his shaggy bangs at the mention of the comet.]

I can't say that I've seen a red comet. A trick of the light, or... what were you told?